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+<text text-anchor="middle" x="154.8447" y="-71.523" font-family="Times,serif" font-size="14.00" fill="#000000">$_DFF_P_</text>
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+<text text-anchor="middle" x="206.6343" y="-78.523" font-family="Times,serif" font-size="14.00" fill="#000000">Q</text>
+</g>
+<!-- n19->c46 -->
+<g id="edge15" class="edge">
+<title>n19:e->c46:w</title>
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+<polygon fill="#000000" stroke="#000000" points="80,-97.2231 90,-93.723 80,-90.2231 80,-97.2231"/>
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+<!-- n20 -->
+<g id="node2" class="node">
+<title>n20</title>
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+<text text-anchor="middle" x="282.6895" y="-209.523" font-family="Times,serif" font-size="14.00" fill="#000000">en</text>
+</g>
+<!-- c30 -->
+<g id="node9" class="node">
+<title>c30</title>
+<polygon fill="none" stroke="#000000" points="519.0585,-258.723 519.0585,-294.723 612.9413,-294.723 612.9413,-258.723 519.0585,-258.723"/>
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+<text text-anchor="middle" x="599.8861" y="-272.523" font-family="Times,serif" font-size="14.00" fill="#000000">Y</text>
+</g>
+<!-- n20->c30 -->
+<g id="edge17" class="edge">
+<title>n20:e->c30:w</title>
+<path fill="none" stroke="#000000" d="M309.6895,-213.723C329.426,-213.723 327.6514,-231.7129 345.6895,-239.723 414.4401,-270.2528 438.1103,-276.2163 508.7161,-276.6905"/>
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+<!-- c39 -->
+<g id="node18" class="node">
+<title>c39</title>
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+<polyline fill="none" stroke="#000000" points="371.7998,-139.723 371.7998,-175.723 "/>
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+<text text-anchor="middle" x="392.6309" y="-146.523" font-family="Times,serif" font-size="14.00" fill="#000000">$b2f</text>
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+<text text-anchor="middle" x="426.5171" y="-153.523" font-family="Times,serif" font-size="14.00" fill="#000000">Y</text>
+</g>
+<!-- n20->c39 -->
+<g id="edge18" class="edge">
+<title>n20:e->c39:w</title>
+<path fill="none" stroke="#000000" d="M309.6895,-213.723C335.1167,-213.723 321.5762,-172.3656 336.0438,-160.7338"/>
+<polygon fill="#000000" stroke="#000000" points="337.1866,-164.0437 345.6895,-157.723 335.1008,-157.3616 337.1866,-164.0437"/>
+</g>
+<!-- n21 -->
+<g id="node3" class="node">
+<title>n21</title>
+<polygon fill="none" stroke="#000000" points="309.6895,-88.2671 309.6895,-103.1788 293.8732,-113.723 271.5057,-113.723 255.6895,-103.1788 255.6895,-88.2671 271.5057,-77.723 293.8732,-77.723 309.6895,-88.2671"/>
+<text text-anchor="middle" x="282.6895" y="-91.523" font-family="Times,serif" font-size="14.00" fill="#000000">out</text>
+</g>
+<!-- c34 -->
+<g id="node13" class="node">
+<title>c34</title>
+<polygon fill="none" stroke="#000000" points="519.0585,-77.723 519.0585,-113.723 612.9413,-113.723 612.9413,-77.723 519.0585,-77.723"/>
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+<polyline fill="none" stroke="#000000" points="545.1688,-77.723 545.1688,-113.723 "/>
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+<text text-anchor="middle" x="565.9999" y="-84.523" font-family="Times,serif" font-size="14.00" fill="#000000">$b2f</text>
+<polyline fill="none" stroke="#000000" points="586.831,-77.723 586.831,-113.723 "/>
+<text text-anchor="middle" x="599.8861" y="-91.523" font-family="Times,serif" font-size="14.00" fill="#000000">Y</text>
+</g>
+<!-- n21->c34 -->
+<g id="edge20" class="edge">
+<title>n21:e->c34:w</title>
+<path fill="none" stroke="#000000" d="M309.6895,-95.723C399.2642,-95.723 424.1509,-95.723 508.9245,-95.723"/>
+<polygon fill="#000000" stroke="#000000" points="508.9999,-99.2231 518.9999,-95.723 508.9999,-92.2231 508.9999,-99.2231"/>
+</g>
+<!-- c40 -->
+<g id="node19" class="node">
+<title>c40</title>
+<polygon fill="none" stroke="#000000" points="345.6895,-194.723 345.6895,-230.723 439.5723,-230.723 439.5723,-194.723 345.6895,-194.723"/>
+<text text-anchor="middle" x="358.7446" y="-208.523" font-family="Times,serif" font-size="14.00" fill="#000000">A</text>
+<polyline fill="none" stroke="#000000" points="371.7998,-194.723 371.7998,-230.723 "/>
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+<text text-anchor="middle" x="392.6309" y="-201.523" font-family="Times,serif" font-size="14.00" fill="#000000">$b2f</text>
+<polyline fill="none" stroke="#000000" points="413.4619,-194.723 413.4619,-230.723 "/>
+<text text-anchor="middle" x="426.5171" y="-208.523" font-family="Times,serif" font-size="14.00" fill="#000000">Y</text>
+</g>
+<!-- n21->c40 -->
+<g id="edge21" class="edge">
+<title>n21:e->c40:w</title>
+<path fill="none" stroke="#000000" d="M309.6895,-95.723C360.0574,-95.723 301.3908,-196.0003 335.5739,-210.8852"/>
+<polygon fill="#000000" stroke="#000000" points="335.2248,-214.379 345.6895,-212.723 336.4762,-207.4917 335.2248,-214.379"/>
+</g>
+<!-- c25 -->
+<g id="node4" class="node">
+<title>c25</title>
+<polygon fill="none" stroke="#000000" points="515.1723,-132.723 515.1723,-176.723 616.8275,-176.723 616.8275,-132.723 515.1723,-132.723"/>
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+<polyline fill="none" stroke="#000000" points="515.1723,-154.723 541.2826,-154.723 "/>
+<text text-anchor="middle" x="528.2274" y="-139.523" font-family="Times,serif" font-size="14.00" fill="#000000">B</text>
+<polyline fill="none" stroke="#000000" points="541.2826,-132.723 541.2826,-176.723 "/>
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+<polyline fill="none" stroke="#000000" points="590.7172,-132.723 590.7172,-176.723 "/>
+<text text-anchor="middle" x="603.7724" y="-150.523" font-family="Times,serif" font-size="14.00" fill="#000000">Y</text>
+</g>
+<!-- c41 -->
+<g id="node20" class="node">
+<title>c41</title>
+<polygon fill="none" stroke="#000000" points="652.8275,-134.723 652.8275,-170.723 746.7104,-170.723 746.7104,-134.723 652.8275,-134.723"/>
+<text text-anchor="middle" x="665.8827" y="-148.523" font-family="Times,serif" font-size="14.00" fill="#000000">A</text>
+<polyline fill="none" stroke="#000000" points="678.9379,-134.723 678.9379,-170.723 "/>
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+<text text-anchor="middle" x="699.7689" y="-141.523" font-family="Times,serif" font-size="14.00" fill="#000000">$f2b</text>
+<polyline fill="none" stroke="#000000" points="720.6,-134.723 720.6,-170.723 "/>
+<text text-anchor="middle" x="733.6552" y="-148.523" font-family="Times,serif" font-size="14.00" fill="#000000">Y</text>
+</g>
+<!-- c25->c41 -->
+<g id="edge13" class="edge">
+<title>c25:e->c41:w</title>
+<path fill="none" stroke="#000000" stroke-width="3" d="M616.8275,-154.723C628.846,-154.723 634.0729,-153.598 642.6956,-153.0355"/>
+<polygon fill="#000000" stroke="#000000" stroke-width="3" points="642.9402,-156.5297 652.8275,-152.723 642.7244,-149.533 642.9402,-156.5297"/>
+</g>
+<!-- c26 -->
+<g id="node5" class="node">
+<title>c26</title>
+<polygon fill="none" stroke="#000000" points="515.1723,-195.723 515.1723,-239.723 616.8275,-239.723 616.8275,-195.723 515.1723,-195.723"/>
+<text text-anchor="middle" x="528.2274" y="-224.523" font-family="Times,serif" font-size="14.00" fill="#000000">A</text>
+<polyline fill="none" stroke="#000000" points="515.1723,-217.723 541.2826,-217.723 "/>
+<text text-anchor="middle" x="528.2274" y="-202.523" font-family="Times,serif" font-size="14.00" fill="#000000">B</text>
+<polyline fill="none" stroke="#000000" points="541.2826,-195.723 541.2826,-239.723 "/>
+<text text-anchor="middle" x="565.9999" y="-220.523" font-family="Times,serif" font-size="14.00" fill="#000000">$57</text>
+<text text-anchor="middle" x="565.9999" y="-206.523" font-family="Times,serif" font-size="14.00" fill="#000000">$NaN</text>
+<polyline fill="none" stroke="#000000" points="590.7172,-195.723 590.7172,-239.723 "/>
+<text text-anchor="middle" x="603.7724" y="-213.523" font-family="Times,serif" font-size="14.00" fill="#000000">Y</text>
+</g>
+<!-- c42 -->
+<g id="node21" class="node">
+<title>c42</title>
+<polygon fill="none" stroke="#000000" points="652.8275,-199.723 652.8275,-235.723 746.7104,-235.723 746.7104,-199.723 652.8275,-199.723"/>
+<text text-anchor="middle" x="665.8827" y="-213.523" font-family="Times,serif" font-size="14.00" fill="#000000">A</text>
+<polyline fill="none" stroke="#000000" points="678.9379,-199.723 678.9379,-235.723 "/>
+<text text-anchor="middle" x="699.7689" y="-220.523" font-family="Times,serif" font-size="14.00" fill="#000000">$68</text>
+<text text-anchor="middle" x="699.7689" y="-206.523" font-family="Times,serif" font-size="14.00" fill="#000000">$f2b</text>
+<polyline fill="none" stroke="#000000" points="720.6,-199.723 720.6,-235.723 "/>
+<text text-anchor="middle" x="733.6552" y="-213.523" font-family="Times,serif" font-size="14.00" fill="#000000">Y</text>
+</g>
+<!-- c26->c42 -->
+<g id="edge14" class="edge">
+<title>c26:e->c42:w</title>
+<path fill="none" stroke="#000000" stroke-width="3" d="M616.8275,-217.723C628.8275,-217.723 634.0775,-217.723 642.7025,-217.723"/>
+<polygon fill="#000000" stroke="#000000" stroke-width="3" points="642.8276,-221.2231 652.8275,-217.723 642.8275,-214.2231 642.8276,-221.2231"/>
+</g>
+<!-- c27 -->
+<g id="node6" class="node">
+<title>c27</title>
+<polygon fill="none" stroke="#000000" points="912.5932,-206.723 912.5932,-250.723 1014.2484,-250.723 1014.2484,-206.723 912.5932,-206.723"/>
+<text text-anchor="middle" x="925.6483" y="-235.523" font-family="Times,serif" font-size="14.00" fill="#000000">A</text>
+<polyline fill="none" stroke="#000000" points="912.5932,-228.723 938.7035,-228.723 "/>
+<text text-anchor="middle" x="925.6483" y="-213.523" font-family="Times,serif" font-size="14.00" fill="#000000">B</text>
+<polyline fill="none" stroke="#000000" points="938.7035,-206.723 938.7035,-250.723 "/>
+<text text-anchor="middle" x="963.4208" y="-231.523" font-family="Times,serif" font-size="14.00" fill="#000000">$58</text>
+<text text-anchor="middle" x="963.4208" y="-217.523" font-family="Times,serif" font-size="14.00" fill="#000000">$NaN</text>
+<polyline fill="none" stroke="#000000" points="988.1381,-206.723 988.1381,-250.723 "/>
+<text text-anchor="middle" x="1001.1933" y="-224.523" font-family="Times,serif" font-size="14.00" fill="#000000">Y</text>
+</g>
+<!-- c36 -->
+<g id="node15" class="node">
+<title>c36</title>
+<polygon fill="none" stroke="#000000" points="1050.2484,-183.723 1050.2484,-219.723 1144.1313,-219.723 1144.1313,-183.723 1050.2484,-183.723"/>
+<text text-anchor="middle" x="1063.3036" y="-197.523" font-family="Times,serif" font-size="14.00" fill="#000000">A</text>
+<polyline fill="none" stroke="#000000" points="1076.3588,-183.723 1076.3588,-219.723 "/>
+<text text-anchor="middle" x="1097.1898" y="-204.523" font-family="Times,serif" font-size="14.00" fill="#000000">$74</text>
+<text text-anchor="middle" x="1097.1898" y="-190.523" font-family="Times,serif" font-size="14.00" fill="#000000">$f2b</text>
+<polyline fill="none" stroke="#000000" points="1118.0209,-183.723 1118.0209,-219.723 "/>
+<text text-anchor="middle" x="1131.0761" y="-197.523" font-family="Times,serif" font-size="14.00" fill="#000000">Y</text>
+</g>
+<!-- c27->c36 -->
+<g id="edge4" class="edge">
+<title>c27:e->c36:w</title>
+<path fill="none" stroke="#000000" stroke-width="3" d="M1014.2484,-228.723C1030.1859,-228.723 1030.8832,-211.5777 1040.6294,-204.6124"/>
+<polygon fill="#000000" stroke="#000000" stroke-width="3" points="1041.6781,-207.952 1050.2484,-201.723 1039.6643,-201.2479 1041.6781,-207.952"/>
+</g>
+<!-- c28 -->
+<g id="node7" class="node">
+<title>c28</title>
+<polygon fill="none" stroke="#000000" points="912.5932,-97.723 912.5932,-141.723 1014.2484,-141.723 1014.2484,-97.723 912.5932,-97.723"/>
+<text text-anchor="middle" x="925.6483" y="-126.523" font-family="Times,serif" font-size="14.00" fill="#000000">A</text>
+<polyline fill="none" stroke="#000000" points="912.5932,-119.723 938.7035,-119.723 "/>
+<text text-anchor="middle" x="925.6483" y="-104.523" font-family="Times,serif" font-size="14.00" fill="#000000">B</text>
+<polyline fill="none" stroke="#000000" points="938.7035,-97.723 938.7035,-141.723 "/>
+<text text-anchor="middle" x="963.4208" y="-122.523" font-family="Times,serif" font-size="14.00" fill="#000000">$59</text>
+<text text-anchor="middle" x="963.4208" y="-108.523" font-family="Times,serif" font-size="14.00" fill="#000000">$NaN</text>
+<polyline fill="none" stroke="#000000" points="988.1381,-97.723 988.1381,-141.723 "/>
+<text text-anchor="middle" x="1001.1933" y="-115.523" font-family="Times,serif" font-size="14.00" fill="#000000">Y</text>
+</g>
+<!-- c37 -->
+<g id="node16" class="node">
+<title>c37</title>
+<polygon fill="none" stroke="#000000" points="1050.2484,-101.723 1050.2484,-137.723 1144.1313,-137.723 1144.1313,-101.723 1050.2484,-101.723"/>
+<text text-anchor="middle" x="1063.3036" y="-115.523" font-family="Times,serif" font-size="14.00" fill="#000000">A</text>
+<polyline fill="none" stroke="#000000" points="1076.3588,-101.723 1076.3588,-137.723 "/>
+<text text-anchor="middle" x="1097.1898" y="-122.523" font-family="Times,serif" font-size="14.00" fill="#000000">$81</text>
+<text text-anchor="middle" x="1097.1898" y="-108.523" font-family="Times,serif" font-size="14.00" fill="#000000">$f2b</text>
+<polyline fill="none" stroke="#000000" points="1118.0209,-101.723 1118.0209,-137.723 "/>
+<text text-anchor="middle" x="1131.0761" y="-115.523" font-family="Times,serif" font-size="14.00" fill="#000000">Y</text>
+</g>
+<!-- c28->c37 -->
+<g id="edge5" class="edge">
+<title>c28:e->c37:w</title>
+<path fill="none" stroke="#000000" stroke-width="3" d="M1014.2484,-119.723C1026.2484,-119.723 1031.4984,-119.723 1040.1234,-119.723"/>
+<polygon fill="#000000" stroke="#000000" stroke-width="3" points="1040.2485,-123.2231 1050.2484,-119.723 1040.2484,-116.2231 1040.2485,-123.2231"/>
+</g>
+<!-- c29 -->
+<g id="node8" class="node">
+<title>c29</title>
+<polygon fill="none" stroke="#000000" points="1310.0141,-108.723 1310.0141,-152.723 1411.6693,-152.723 1411.6693,-108.723 1310.0141,-108.723"/>
+<text text-anchor="middle" x="1323.0692" y="-137.523" font-family="Times,serif" font-size="14.00" fill="#000000">A</text>
+<polyline fill="none" stroke="#000000" points="1310.0141,-130.723 1336.1244,-130.723 "/>
+<text text-anchor="middle" x="1323.0692" y="-115.523" font-family="Times,serif" font-size="14.00" fill="#000000">B</text>
+<polyline fill="none" stroke="#000000" points="1336.1244,-108.723 1336.1244,-152.723 "/>
+<text text-anchor="middle" x="1360.8417" y="-133.523" font-family="Times,serif" font-size="14.00" fill="#000000">$60</text>
+<text text-anchor="middle" x="1360.8417" y="-119.523" font-family="Times,serif" font-size="14.00" fill="#000000">$NaN</text>
+<polyline fill="none" stroke="#000000" points="1385.559,-108.723 1385.559,-152.723 "/>
+<text text-anchor="middle" x="1398.6142" y="-126.523" font-family="Times,serif" font-size="14.00" fill="#000000">Y</text>
+</g>
+<!-- c38 -->
+<g id="node17" class="node">
+<title>c38</title>
+<polygon fill="none" stroke="#000000" points="1447.6693,-79.723 1447.6693,-115.723 1541.5521,-115.723 1541.5521,-79.723 1447.6693,-79.723"/>
+<text text-anchor="middle" x="1460.7245" y="-93.523" font-family="Times,serif" font-size="14.00" fill="#000000">A</text>
+<polyline fill="none" stroke="#000000" points="1473.7797,-79.723 1473.7797,-115.723 "/>
+<text text-anchor="middle" x="1494.6107" y="-100.523" font-family="Times,serif" font-size="14.00" fill="#000000">$88</text>
+<text text-anchor="middle" x="1494.6107" y="-86.523" font-family="Times,serif" font-size="14.00" fill="#000000">$f2b</text>
+<polyline fill="none" stroke="#000000" points="1515.4418,-79.723 1515.4418,-115.723 "/>
+<text text-anchor="middle" x="1528.497" y="-93.523" font-family="Times,serif" font-size="14.00" fill="#000000">Y</text>
+</g>
+<!-- c29->c38 -->
+<g id="edge6" class="edge">
+<title>c29:e->c38:w</title>
+<path fill="none" stroke="#000000" stroke-width="3" d="M1411.6693,-130.723C1429.1352,-130.723 1427.7482,-109.3547 1437.8496,-101.0078"/>
+<polygon fill="#000000" stroke="#000000" stroke-width="3" points="1439.2962,-104.2146 1447.6693,-97.723 1437.0755,-97.5762 1439.2962,-104.2146"/>
+</g>
+<!-- c30->c27 -->
+<g id="edge25" class="edge">
+<title>c30:e->c27:w</title>
+<path fill="none" stroke="#000000" stroke-width="3" d="M612.9999,-276.723C731.0126,-276.723 759.5672,-259.9521 876.5932,-244.723 888.6071,-243.1596 893.7637,-241.1288 902.406,-240.2111"/>
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+</g>
+<!-- c31 -->
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+<polyline fill="none" stroke="#000000" points="371.7998,-192.9408 371.7998,-228.9408 "/>
+<text text-anchor="middle" x="392.6309" y="-213.7408" font-family="Times,serif" font-size="14.00" fill="#000000">$66</text>
+<text text-anchor="middle" x="392.6309" y="-199.7408" font-family="Times,serif" font-size="14.00" fill="#000000">$b2f</text>
+<polyline fill="none" stroke="#000000" points="413.4619,-192.9408 413.4619,-228.9408 "/>
+<text text-anchor="middle" x="426.5171" y="-206.7408" font-family="Times,serif" font-size="14.00" fill="#000000">Y</text>
+</g>
+<!-- n19->c36 -->
+<g id="edge15" class="edge">
+<title>n19:e->c36:w</title>
+<path fill="none" stroke="#000000" d="M309.6895,-178.9408C326.9156,-178.9408 325.8675,-199.6615 335.9553,-207.7555"/>
+<polygon fill="#000000" stroke="#000000" points="335.0968,-211.1572 345.6895,-210.9408 337.2739,-204.5043 335.0968,-211.1572"/>
+</g>
+<!-- c23 -->
+<g id="node4" class="node">
+<title>c23</title>
+<polygon fill="none" stroke="#000000" points="515.1723,-91.9408 515.1723,-135.9408 616.8275,-135.9408 616.8275,-91.9408 515.1723,-91.9408"/>
+<text text-anchor="middle" x="528.2274" y="-120.7408" font-family="Times,serif" font-size="14.00" fill="#000000">A</text>
+<polyline fill="none" stroke="#000000" points="515.1723,-113.9408 541.2826,-113.9408 "/>
+<text text-anchor="middle" x="528.2274" y="-98.7408" font-family="Times,serif" font-size="14.00" fill="#000000">B</text>
+<polyline fill="none" stroke="#000000" points="541.2826,-91.9408 541.2826,-135.9408 "/>
+<text text-anchor="middle" x="565.9999" y="-116.7408" font-family="Times,serif" font-size="14.00" fill="#000000">$56</text>
+<text text-anchor="middle" x="565.9999" y="-102.7408" font-family="Times,serif" font-size="14.00" fill="#000000">$NaN</text>
+<polyline fill="none" stroke="#000000" points="590.7172,-91.9408 590.7172,-135.9408 "/>
+<text text-anchor="middle" x="603.7724" y="-109.7408" font-family="Times,serif" font-size="14.00" fill="#000000">Y</text>
+</g>
+<!-- c37 -->
+<g id="node18" class="node">
+<title>c37</title>
+<polygon fill="none" stroke="#000000" points="652.8275,-137.9408 652.8275,-173.9408 746.7104,-173.9408 746.7104,-137.9408 652.8275,-137.9408"/>
+<text text-anchor="middle" x="665.8827" y="-151.7408" font-family="Times,serif" font-size="14.00" fill="#000000">A</text>
+<polyline fill="none" stroke="#000000" points="678.9379,-137.9408 678.9379,-173.9408 "/>
+<text text-anchor="middle" x="699.7689" y="-158.7408" font-family="Times,serif" font-size="14.00" fill="#000000">$63</text>
+<text text-anchor="middle" x="699.7689" y="-144.7408" font-family="Times,serif" font-size="14.00" fill="#000000">$f2b</text>
+<polyline fill="none" stroke="#000000" points="720.6,-137.9408 720.6,-173.9408 "/>
+<text text-anchor="middle" x="733.6552" y="-151.7408" font-family="Times,serif" font-size="14.00" fill="#000000">Y</text>
+</g>
+<!-- c23->c37 -->
+<g id="edge10" class="edge">
+<title>c23:e->c37:w</title>
+<path fill="none" stroke="#000000" stroke-width="3" d="M616.8275,-113.9408C637.1874,-113.9408 631.6542,-142.744 643.1133,-152.6451"/>
+<polygon fill="#000000" stroke="#000000" stroke-width="3" points="642.2332,-156.0424 652.8275,-155.9408 644.4822,-149.4135 642.2332,-156.0424"/>
+</g>
+<!-- c24 -->
+<g id="node5" class="node">
+<title>c24</title>
+<polygon fill="none" stroke="#000000" points="515.1723,-231.9408 515.1723,-275.9408 616.8275,-275.9408 616.8275,-231.9408 515.1723,-231.9408"/>
+<text text-anchor="middle" x="528.2274" y="-260.7408" font-family="Times,serif" font-size="14.00" fill="#000000">A</text>
+<polyline fill="none" stroke="#000000" points="515.1723,-253.9408 541.2826,-253.9408 "/>
+<text text-anchor="middle" x="528.2274" y="-238.7408" font-family="Times,serif" font-size="14.00" fill="#000000">B</text>
+<polyline fill="none" stroke="#000000" points="541.2826,-231.9408 541.2826,-275.9408 "/>
+<text text-anchor="middle" x="565.9999" y="-256.7408" font-family="Times,serif" font-size="14.00" fill="#000000">$57</text>
+<text text-anchor="middle" x="565.9999" y="-242.7408" font-family="Times,serif" font-size="14.00" fill="#000000">$NaN</text>
+<polyline fill="none" stroke="#000000" points="590.7172,-231.9408 590.7172,-275.9408 "/>
+<text text-anchor="middle" x="603.7724" y="-249.7408" font-family="Times,serif" font-size="14.00" fill="#000000">Y</text>
+</g>
+<!-- c38 -->
+<g id="node19" class="node">
+<title>c38</title>
+<polygon fill="none" stroke="#000000" points="652.8275,-233.9408 652.8275,-269.9408 746.7104,-269.9408 746.7104,-233.9408 652.8275,-233.9408"/>
+<text text-anchor="middle" x="665.8827" y="-247.7408" font-family="Times,serif" font-size="14.00" fill="#000000">A</text>
+<polyline fill="none" stroke="#000000" points="678.9379,-233.9408 678.9379,-269.9408 "/>
+<text text-anchor="middle" x="699.7689" y="-254.7408" font-family="Times,serif" font-size="14.00" fill="#000000">$68</text>
+<text text-anchor="middle" x="699.7689" y="-240.7408" font-family="Times,serif" font-size="14.00" fill="#000000">$f2b</text>
+<polyline fill="none" stroke="#000000" points="720.6,-233.9408 720.6,-269.9408 "/>
+<text text-anchor="middle" x="733.6552" y="-247.7408" font-family="Times,serif" font-size="14.00" fill="#000000">Y</text>
+</g>
+<!-- c24->c38 -->
+<g id="edge11" class="edge">
+<title>c24:e->c38:w</title>
+<path fill="none" stroke="#000000" stroke-width="3" d="M616.8275,-253.9408C628.846,-253.9408 634.0729,-252.8158 642.6956,-252.2533"/>
+<polygon fill="#000000" stroke="#000000" stroke-width="3" points="642.9402,-255.7475 652.8275,-251.9408 642.7244,-248.7508 642.9402,-255.7475"/>
+</g>
+<!-- c25 -->
+<g id="node6" class="node">
+<title>c25</title>
+<polygon fill="none" stroke="#000000" points="912.5932,-169.9408 912.5932,-213.9408 1014.2484,-213.9408 1014.2484,-169.9408 912.5932,-169.9408"/>
+<text text-anchor="middle" x="925.6483" y="-198.7408" font-family="Times,serif" font-size="14.00" fill="#000000">A</text>
+<polyline fill="none" stroke="#000000" points="912.5932,-191.9408 938.7035,-191.9408 "/>
+<text text-anchor="middle" x="925.6483" y="-176.7408" font-family="Times,serif" font-size="14.00" fill="#000000">B</text>
+<polyline fill="none" stroke="#000000" points="938.7035,-169.9408 938.7035,-213.9408 "/>
+<text text-anchor="middle" x="963.4208" y="-194.7408" font-family="Times,serif" font-size="14.00" fill="#000000">$58</text>
+<text text-anchor="middle" x="963.4208" y="-180.7408" font-family="Times,serif" font-size="14.00" fill="#000000">$NaN</text>
+<polyline fill="none" stroke="#000000" points="988.1381,-169.9408 988.1381,-213.9408 "/>
+<text text-anchor="middle" x="1001.1933" y="-187.7408" font-family="Times,serif" font-size="14.00" fill="#000000">Y</text>
+</g>
+<!-- c32 -->
+<g id="node13" class="node">
+<title>c32</title>
+<polygon fill="none" stroke="#000000" points="1050.2484,-166.9408 1050.2484,-202.9408 1144.1313,-202.9408 1144.1313,-166.9408 1050.2484,-166.9408"/>
+<text text-anchor="middle" x="1063.3036" y="-180.7408" font-family="Times,serif" font-size="14.00" fill="#000000">A</text>
+<polyline fill="none" stroke="#000000" points="1076.3588,-166.9408 1076.3588,-202.9408 "/>
+<text text-anchor="middle" x="1097.1898" y="-187.7408" font-family="Times,serif" font-size="14.00" fill="#000000">$74</text>
+<text text-anchor="middle" x="1097.1898" y="-173.7408" font-family="Times,serif" font-size="14.00" fill="#000000">$f2b</text>
+<polyline fill="none" stroke="#000000" points="1118.0209,-166.9408 1118.0209,-202.9408 "/>
+<text text-anchor="middle" x="1131.0761" y="-180.7408" font-family="Times,serif" font-size="14.00" fill="#000000">Y</text>
+</g>
+<!-- c25->c32 -->
+<g id="edge7" class="edge">
+<title>c25:e->c32:w</title>
+<path fill="none" stroke="#000000" stroke-width="3" d="M1014.2484,-191.9408C1026.4732,-191.9408 1031.4423,-188.0033 1040.0392,-186.0345"/>
+<polygon fill="#000000" stroke="#000000" stroke-width="3" points="1040.6782,-189.4862 1050.2484,-184.9408 1039.9325,-182.526 1040.6782,-189.4862"/>
+</g>
+<!-- c26 -->
+<g id="node7" class="node">
+<title>c26</title>
+<polygon fill="none" stroke="#000000" points="912.5932,-101.9408 912.5932,-145.9408 1014.2484,-145.9408 1014.2484,-101.9408 912.5932,-101.9408"/>
+<text text-anchor="middle" x="925.6483" y="-130.7408" font-family="Times,serif" font-size="14.00" fill="#000000">A</text>
+<polyline fill="none" stroke="#000000" points="912.5932,-123.9408 938.7035,-123.9408 "/>
+<text text-anchor="middle" x="925.6483" y="-108.7408" font-family="Times,serif" font-size="14.00" fill="#000000">B</text>
+<polyline fill="none" stroke="#000000" points="938.7035,-101.9408 938.7035,-145.9408 "/>
+<text text-anchor="middle" x="963.4208" y="-126.7408" font-family="Times,serif" font-size="14.00" fill="#000000">$59</text>
+<text text-anchor="middle" x="963.4208" y="-112.7408" font-family="Times,serif" font-size="14.00" fill="#000000">$NaN</text>
+<polyline fill="none" stroke="#000000" points="988.1381,-101.9408 988.1381,-145.9408 "/>
+<text text-anchor="middle" x="1001.1933" y="-119.7408" font-family="Times,serif" font-size="14.00" fill="#000000">Y</text>
+</g>
+<!-- c33 -->
+<g id="node14" class="node">
+<title>c33</title>
+<polygon fill="none" stroke="#000000" points="1050.2484,-105.9408 1050.2484,-141.9408 1144.1313,-141.9408 1144.1313,-105.9408 1050.2484,-105.9408"/>
+<text text-anchor="middle" x="1063.3036" y="-119.7408" font-family="Times,serif" font-size="14.00" fill="#000000">A</text>
+<polyline fill="none" stroke="#000000" points="1076.3588,-105.9408 1076.3588,-141.9408 "/>
+<text text-anchor="middle" x="1097.1898" y="-126.7408" font-family="Times,serif" font-size="14.00" fill="#000000">$81</text>
+<text text-anchor="middle" x="1097.1898" y="-112.7408" font-family="Times,serif" font-size="14.00" fill="#000000">$f2b</text>
+<polyline fill="none" stroke="#000000" points="1118.0209,-105.9408 1118.0209,-141.9408 "/>
+<text text-anchor="middle" x="1131.0761" y="-119.7408" font-family="Times,serif" font-size="14.00" fill="#000000">Y</text>
+</g>
+<!-- c26->c33 -->
+<g id="edge8" class="edge">
+<title>c26:e->c33:w</title>
+<path fill="none" stroke="#000000" stroke-width="3" d="M1014.2484,-123.9408C1026.2484,-123.9408 1031.4984,-123.9408 1040.1234,-123.9408"/>
+<polygon fill="#000000" stroke="#000000" stroke-width="3" points="1040.2485,-127.4409 1050.2484,-123.9408 1040.2484,-120.4409 1040.2485,-127.4409"/>
+</g>
+<!-- c27 -->
+<g id="node8" class="node">
+<title>c27</title>
+<polygon fill="none" stroke="#000000" points="1310.0141,-112.9408 1310.0141,-156.9408 1411.6693,-156.9408 1411.6693,-112.9408 1310.0141,-112.9408"/>
+<text text-anchor="middle" x="1323.0692" y="-141.7408" font-family="Times,serif" font-size="14.00" fill="#000000">A</text>
+<polyline fill="none" stroke="#000000" points="1310.0141,-134.9408 1336.1244,-134.9408 "/>
+<text text-anchor="middle" x="1323.0692" y="-119.7408" font-family="Times,serif" font-size="14.00" fill="#000000">B</text>
+<polyline fill="none" stroke="#000000" points="1336.1244,-112.9408 1336.1244,-156.9408 "/>
+<text text-anchor="middle" x="1360.8417" y="-137.7408" font-family="Times,serif" font-size="14.00" fill="#000000">$60</text>
+<text text-anchor="middle" x="1360.8417" y="-123.7408" font-family="Times,serif" font-size="14.00" fill="#000000">$NaN</text>
+<polyline fill="none" stroke="#000000" points="1385.559,-112.9408 1385.559,-156.9408 "/>
+<text text-anchor="middle" x="1398.6142" y="-130.7408" font-family="Times,serif" font-size="14.00" fill="#000000">Y</text>
+</g>
+<!-- c34 -->
+<g id="node15" class="node">
+<title>c34</title>
+<polygon fill="none" stroke="#000000" points="1447.6693,-89.9408 1447.6693,-125.9408 1541.5521,-125.9408 1541.5521,-89.9408 1447.6693,-89.9408"/>
+<text text-anchor="middle" x="1460.7245" y="-103.7408" font-family="Times,serif" font-size="14.00" fill="#000000">A</text>
+<polyline fill="none" stroke="#000000" points="1473.7797,-89.9408 1473.7797,-125.9408 "/>
+<text text-anchor="middle" x="1494.6107" y="-110.7408" font-family="Times,serif" font-size="14.00" fill="#000000">$88</text>
+<text text-anchor="middle" x="1494.6107" y="-96.7408" font-family="Times,serif" font-size="14.00" fill="#000000">$f2b</text>
+<polyline fill="none" stroke="#000000" points="1515.4418,-89.9408 1515.4418,-125.9408 "/>
+<text text-anchor="middle" x="1528.497" y="-103.7408" font-family="Times,serif" font-size="14.00" fill="#000000">Y</text>
+</g>
+<!-- c27->c34 -->
+<g id="edge9" class="edge">
+<title>c27:e->c34:w</title>
+<path fill="none" stroke="#000000" stroke-width="3" d="M1411.6693,-134.9408C1427.6068,-134.9408 1428.3041,-117.7955 1438.0503,-110.8303"/>
+<polygon fill="#000000" stroke="#000000" stroke-width="3" points="1439.099,-114.1698 1447.6693,-107.9408 1437.0852,-107.4657 1439.099,-114.1698"/>
+</g>
+<!-- c28 -->
+<g id="node9" class="node">
+<title>c28</title>
+<polygon fill="none" stroke="#000000" points="782.7104,-137.9408 782.7104,-173.9408 876.5932,-173.9408 876.5932,-137.9408 782.7104,-137.9408"/>
+<text text-anchor="middle" x="795.7655" y="-151.7408" font-family="Times,serif" font-size="14.00" fill="#000000">A</text>
+<polyline fill="none" stroke="#000000" points="808.8207,-137.9408 808.8207,-173.9408 "/>
+<text text-anchor="middle" x="829.6518" y="-158.7408" font-family="Times,serif" font-size="14.00" fill="#000000">$78</text>
+<text text-anchor="middle" x="829.6518" y="-144.7408" font-family="Times,serif" font-size="14.00" fill="#000000">$b2f</text>
+<polyline fill="none" stroke="#000000" points="850.4828,-137.9408 850.4828,-173.9408 "/>
+<text text-anchor="middle" x="863.538" y="-151.7408" font-family="Times,serif" font-size="14.00" fill="#000000">Y</text>
+</g>
+<!-- c28->c26 -->
+<g id="edge24" class="edge">
+<title>c28:e->c26:w</title>
+<path fill="none" stroke="#000000" stroke-width="3" d="M876.5932,-155.9408C891.0645,-155.9408 893.5913,-143.1234 902.8369,-137.5158"/>
+<polygon fill="#000000" stroke="#000000" stroke-width="3" points="903.8175,-140.8769 912.5932,-134.9408 902.0311,-134.1087 903.8175,-140.8769"/>
+</g>
+<!-- c29 -->
+<g id="node10" class="node">
+<title>c29</title>
+<polygon fill="none" stroke="#000000" points="1180.1313,-163.9408 1180.1313,-199.9408 1274.0141,-199.9408 1274.0141,-163.9408 1180.1313,-163.9408"/>
+<text text-anchor="middle" x="1193.1864" y="-177.7408" font-family="Times,serif" font-size="14.00" fill="#000000">A</text>
+<polyline fill="none" stroke="#000000" points="1206.2416,-163.9408 1206.2416,-199.9408 "/>
+<text text-anchor="middle" x="1227.0727" y="-184.7408" font-family="Times,serif" font-size="14.00" fill="#000000">$85</text>
+<text text-anchor="middle" x="1227.0727" y="-170.7408" font-family="Times,serif" font-size="14.00" fill="#000000">$b2f</text>
+<polyline fill="none" stroke="#000000" points="1247.9037,-163.9408 1247.9037,-199.9408 "/>
+<text text-anchor="middle" x="1260.9589" y="-177.7408" font-family="Times,serif" font-size="14.00" fill="#000000">Y</text>
+</g>
+<!-- c29->c27 -->
+<g id="edge25" class="edge">
+<title>c29:e->c27:w</title>
+<path fill="none" stroke="#000000" stroke-width="3" d="M1274.0141,-181.9408C1292.3988,-181.9408 1289.7363,-158.1752 1300.2284,-149.2631"/>
+<polygon fill="#000000" stroke="#000000" stroke-width="3" points="1301.6701,-152.4699 1310.0141,-145.9408 1299.4197,-145.8415 1301.6701,-152.4699"/>
+</g>
+<!-- c30 -->
+<g id="node11" class="node">
+<title>c30</title>
+<polygon fill="none" stroke="#000000" points="782.7104,-232.9408 782.7104,-268.9408 876.5932,-268.9408 876.5932,-232.9408 782.7104,-232.9408"/>
+<text text-anchor="middle" x="795.7655" y="-246.7408" font-family="Times,serif" font-size="14.00" fill="#000000">A</text>
+<polyline fill="none" stroke="#000000" points="808.8207,-232.9408 808.8207,-268.9408 "/>
+<text text-anchor="middle" x="829.6518" y="-253.7408" font-family="Times,serif" font-size="14.00" fill="#000000">$72</text>
+<text text-anchor="middle" x="829.6518" y="-239.7408" font-family="Times,serif" font-size="14.00" fill="#000000">$b2f</text>
+<polyline fill="none" stroke="#000000" points="850.4828,-232.9408 850.4828,-268.9408 "/>
+<text text-anchor="middle" x="863.538" y="-246.7408" font-family="Times,serif" font-size="14.00" fill="#000000">Y</text>
+</g>
+<!-- c30->c25 -->
+<g id="edge26" class="edge">
+<title>c30:e->c25:w</title>
+<path fill="none" stroke="#000000" stroke-width="3" d="M876.5932,-250.9408C907.4777,-250.9408 884.6233,-196.3857 902.9128,-183.5994"/>
+<polygon fill="#000000" stroke="#000000" stroke-width="3" points="903.8772,-186.9642 912.5932,-180.9408 902.0233,-180.2142 903.8772,-186.9642"/>
+</g>
+<!-- c31 -->
+<g id="node12" class="node">
+<title>c31</title>
+<polygon fill="none" stroke="#000000" points="1180.1313,-105.9408 1180.1313,-141.9408 1274.0141,-141.9408 1274.0141,-105.9408 1180.1313,-105.9408"/>
+<text text-anchor="middle" x="1193.1864" y="-119.7408" font-family="Times,serif" font-size="14.00" fill="#000000">A</text>
+<polyline fill="none" stroke="#000000" points="1206.2416,-105.9408 1206.2416,-141.9408 "/>
+<text text-anchor="middle" x="1227.0727" y="-126.7408" font-family="Times,serif" font-size="14.00" fill="#000000">$86</text>
+<text text-anchor="middle" x="1227.0727" y="-112.7408" font-family="Times,serif" font-size="14.00" fill="#000000">$b2f</text>
+<polyline fill="none" stroke="#000000" points="1247.9037,-105.9408 1247.9037,-141.9408 "/>
+<text text-anchor="middle" x="1260.9589" y="-119.7408" font-family="Times,serif" font-size="14.00" fill="#000000">Y</text>
+</g>
+<!-- c31->c27 -->
+<g id="edge6" class="edge">
+<title>c31:e->c27:w</title>
+<path fill="none" stroke="#000000" stroke-width="3" d="M1274.0141,-123.9408C1286.0141,-123.9408 1291.2641,-123.9408 1299.8891,-123.9408"/>
+<polygon fill="#000000" stroke="#000000" stroke-width="3" points="1300.0141,-127.4409 1310.0141,-123.9408 1300.014,-120.4409 1300.0141,-127.4409"/>
+</g>
+<!-- c32->c29 -->
+<g id="edge18" class="edge">
+<title>c32:e->c29:w</title>
+<path fill="none" stroke="#000000" d="M1144.1313,-184.9408C1156.1728,-184.9408 1161.3709,-183.2533 1169.9907,-182.4095"/>
+<polygon fill="#000000" stroke="#000000" points="1170.3036,-185.8989 1180.1313,-181.9408 1169.9803,-178.9064 1170.3036,-185.8989"/>
+</g>
+<!-- c33->c31 -->
+<g id="edge19" class="edge">
+<title>c33:e->c31:w</title>
+<path fill="none" stroke="#000000" d="M1144.1313,-123.9408C1156.1313,-123.9408 1161.3813,-123.9408 1170.0063,-123.9408"/>
+<polygon fill="#000000" stroke="#000000" points="1170.1313,-127.4409 1180.1313,-123.9408 1170.1312,-120.4409 1170.1313,-127.4409"/>
+</g>
+<!-- c34->c42 -->
+<g id="edge1" class="edge">
+<title>c34:s->c42:s</title>
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+<!-- c35->n6 -->
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+<!-- c38->c30 -->
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+<g id="edge4" class="edge">
+<title>n10:e->c24:w</title>
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+<g id="edge5" class="edge">
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+<g id="edge21" class="edge">
+<title>n6:e->c23:w</title>
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+<!-- n6->c23 -->
+<g id="edge22" class="edge">
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+<!-- n6->c25 -->
+<g id="edge23" class="edge">
+<title>n6:e->c25:w</title>
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+}
--- /dev/null
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+<g id="edge35" class="edge">
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+<title>n19:e->c37:w</title>
+<path fill="none" stroke="#000000" d="M114.4453,-128.5C153.5006,-128.5 119.8178,-56.2266 145.2347,-42.6753"/>
+<polygon fill="#000000" stroke="#000000" points="146.1465,-46.0586 155.166,-40.5 144.6487,-39.2207 146.1465,-46.0586"/>
+</g>
+<!-- x0->c35 -->
+<g id="edge1" class="edge">
+<title>x0:e->c35:w</title>
+<path fill="none" stroke="#000000" d="M130.3832,-178.7178C136.9563,-171.2327 137.363,-156.8305 143.9146,-149.3213"/>
+<polygon fill="none" stroke="#000000" points="130.2048,-178.7939 126.2541,-184.8265 119.166,-183.5 123.1167,-177.4674 130.2048,-178.7939"/>
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+</g>
+<!-- x2->c36 -->
+<g id="edge3" class="edge">
+<title>x2:e->c36:w</title>
+<path fill="none" stroke="#000000" d="M131.2248,-75.2755C135.4526,-76.6012 138.8934,-78.405 143.1232,-79.7295"/>
+<polygon fill="none" stroke="#000000" points="131.0381,-75.2481 124.5194,-78.3314 119.166,-73.5 125.6847,-70.4167 131.0381,-75.2481"/>
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+</g>
+<!-- x4->c37 -->
+<g id="edge5" class="edge">
+<title>x4:e->c37:w</title>
+<path fill="none" stroke="#000000" d="M131.3828,-18.5C135.4598,-18.5 138.9007,-18.5 142.981,-18.5"/>
+<polygon fill="none" stroke="#000000" points="131.166,-18.5001 125.166,-22.5 119.166,-18.5 125.1661,-14.5 131.166,-18.5001"/>
+<polygon fill="none" stroke="#000000" points="143.166,-18.5001 149.166,-14.5 155.166,-18.5 149.1661,-22.5 143.166,-18.5001"/>
+</g>
+<!-- x1 -->
+<g id="node18" class="node">
+<title>x1</title>
+<path fill="none" stroke="#000000" d="M332.8555,-131.5C332.8555,-131.5 372.2969,-131.5 372.2969,-131.5 378.2969,-131.5 384.2969,-137.5 384.2969,-143.5 384.2969,-143.5 384.2969,-155.5 384.2969,-155.5 384.2969,-161.5 378.2969,-167.5 372.2969,-167.5 372.2969,-167.5 332.8555,-167.5 332.8555,-167.5 326.8555,-167.5 320.8555,-161.5 320.8555,-155.5 320.8555,-155.5 320.8555,-143.5 320.8555,-143.5 320.8555,-137.5 326.8555,-131.5 332.8555,-131.5"/>
+<text text-anchor="middle" x="352.5762" y="-145.3" font-family="Times,serif" font-size="14.00" fill="#000000">0:0 - 0:0</text>
+</g>
+<!-- c35->x1 -->
+<g id="edge2" class="edge">
+<title>c35:e->x1:w</title>
+<path fill="none" stroke="#000000" d="M296.8721,-154.1684C301.1179,-153.1741 304.6071,-151.8213 308.8548,-150.8279"/>
+<polygon fill="none" stroke="#000000" points="296.7825,-154.1782 291.2596,-158.8148 284.8555,-155.5 290.3784,-150.8635 296.7825,-154.1782"/>
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+</g>
+<!-- x3 -->
+<g id="node19" class="node">
+<title>x3</title>
+<path fill="none" stroke="#000000" d="M332.8555,-70.5C332.8555,-70.5 372.2969,-70.5 372.2969,-70.5 378.2969,-70.5 384.2969,-76.5 384.2969,-82.5 384.2969,-82.5 384.2969,-94.5 384.2969,-94.5 384.2969,-100.5 378.2969,-106.5 372.2969,-106.5 372.2969,-106.5 332.8555,-106.5 332.8555,-106.5 326.8555,-106.5 320.8555,-100.5 320.8555,-94.5 320.8555,-94.5 320.8555,-82.5 320.8555,-82.5 320.8555,-76.5 326.8555,-70.5 332.8555,-70.5"/>
+<text text-anchor="middle" x="352.5762" y="-84.3" font-family="Times,serif" font-size="14.00" fill="#000000">0:0 - 1:1</text>
+</g>
+<!-- c36->x3 -->
+<g id="edge4" class="edge">
+<title>c36:e->x3:w</title>
+<path fill="none" stroke="#000000" d="M296.8418,-91.6123C301.1005,-90.9494 304.6246,-90.0475 308.8852,-89.3852"/>
+<polygon fill="none" stroke="#000000" points="296.8227,-91.6136 291.1346,-96.0459 284.8555,-92.5 290.5436,-88.0677 296.8227,-91.6136"/>
+<polygon fill="none" stroke="#000000" points="308.8882,-89.3851 314.5768,-84.9535 320.8555,-88.5 315.1669,-92.9317 308.8882,-89.3851"/>
+</g>
+<!-- x5 -->
+<g id="node20" class="node">
+<title>x5</title>
+<path fill="none" stroke="#000000" d="M332.8555,-13.5C332.8555,-13.5 372.2969,-13.5 372.2969,-13.5 378.2969,-13.5 384.2969,-19.5 384.2969,-25.5 384.2969,-25.5 384.2969,-37.5 384.2969,-37.5 384.2969,-43.5 378.2969,-49.5 372.2969,-49.5 372.2969,-49.5 332.8555,-49.5 332.8555,-49.5 326.8555,-49.5 320.8555,-43.5 320.8555,-37.5 320.8555,-37.5 320.8555,-25.5 320.8555,-25.5 320.8555,-19.5 326.8555,-13.5 332.8555,-13.5"/>
+<text text-anchor="middle" x="352.5762" y="-27.3" font-family="Times,serif" font-size="14.00" fill="#000000">0:0 - 2:2</text>
+</g>
+<!-- c37->x5 -->
+<g id="edge6" class="edge">
+<title>c37:e->x5:w</title>
+<path fill="none" stroke="#000000" d="M297.0783,-29.9639C301.1526,-30.287 304.5869,-30.7161 308.6645,-31.0386"/>
+<polygon fill="none" stroke="#000000" points="296.8469,-29.9552 290.6995,-33.7247 284.8555,-29.5 291.0029,-25.7305 296.8469,-29.9552"/>
+<polygon fill="none" stroke="#000000" points="308.8641,-31.0461 315.0111,-27.2759 320.8555,-31.5 314.7085,-35.2702 308.8641,-31.0461"/>
+</g>
+<!-- n20 -->
+<g id="node9" class="node">
+<title>n20</title>
+<polygon fill="none" stroke="#000000" points="643.7797,-157.0442 643.7797,-171.9558 627.9635,-182.5 605.596,-182.5 589.7797,-171.9558 589.7797,-157.0442 605.596,-146.5 627.9635,-146.5 643.7797,-157.0442"/>
+<text text-anchor="middle" x="616.7797" y="-160.3" font-family="Times,serif" font-size="14.00" fill="#000000">en</text>
+</g>
+<!-- c45 -->
+<g id="node28" class="node">
+<title>c45</title>
+<polygon fill="none" stroke="#000000" points="679.7797,-146.5 679.7797,-182.5 773.6625,-182.5 773.6625,-146.5 679.7797,-146.5"/>
+<text text-anchor="middle" x="692.8349" y="-160.3" font-family="Times,serif" font-size="14.00" fill="#000000">A</text>
+<polyline fill="none" stroke="#000000" points="705.8901,-146.5 705.8901,-182.5 "/>
+<text text-anchor="middle" x="726.7211" y="-167.3" font-family="Times,serif" font-size="14.00" fill="#000000">$61</text>
+<text text-anchor="middle" x="726.7211" y="-153.3" font-family="Times,serif" font-size="14.00" fill="#000000">$b2f</text>
+<polyline fill="none" stroke="#000000" points="747.5522,-146.5 747.5522,-182.5 "/>
+<text text-anchor="middle" x="760.6074" y="-160.3" font-family="Times,serif" font-size="14.00" fill="#000000">Y</text>
+</g>
+<!-- n20->c45 -->
+<g id="edge24" class="edge">
+<title>n20:e->c45:w</title>
+<path fill="none" stroke="#000000" d="M643.7797,-164.5C655.7797,-164.5 661.0297,-164.5 669.6547,-164.5"/>
+<polygon fill="#000000" stroke="#000000" points="669.7798,-168.0001 679.7797,-164.5 669.7797,-161.0001 669.7798,-168.0001"/>
+</g>
+<!-- n21 -->
+<g id="node10" class="node">
+<title>n21</title>
+<polygon fill="none" stroke="#000000" points="643.7797,-74.0442 643.7797,-88.9558 627.9635,-99.5 605.596,-99.5 589.7797,-88.9558 589.7797,-74.0442 605.596,-63.5 627.9635,-63.5 643.7797,-74.0442"/>
+<text text-anchor="middle" x="616.7797" y="-77.3" font-family="Times,serif" font-size="14.00" fill="#000000">out</text>
+</g>
+<!-- c46 -->
+<g id="node29" class="node">
+<title>c46</title>
+<polygon fill="none" stroke="#000000" points="679.7797,-62.5 679.7797,-98.5 773.6625,-98.5 773.6625,-62.5 679.7797,-62.5"/>
+<text text-anchor="middle" x="692.8349" y="-76.3" font-family="Times,serif" font-size="14.00" fill="#000000">A</text>
+<polyline fill="none" stroke="#000000" points="705.8901,-62.5 705.8901,-98.5 "/>
+<text text-anchor="middle" x="726.7211" y="-83.3" font-family="Times,serif" font-size="14.00" fill="#000000">$66</text>
+<text text-anchor="middle" x="726.7211" y="-69.3" font-family="Times,serif" font-size="14.00" fill="#000000">$b2f</text>
+<polyline fill="none" stroke="#000000" points="747.5522,-62.5 747.5522,-98.5 "/>
+<text text-anchor="middle" x="760.6074" y="-76.3" font-family="Times,serif" font-size="14.00" fill="#000000">Y</text>
+</g>
+<!-- n21->c46 -->
+<g id="edge26" class="edge">
+<title>n21:e->c46:w</title>
+<path fill="none" stroke="#000000" d="M643.7797,-81.5C655.7843,-81.5 661.0286,-80.9375 669.653,-80.6563"/>
+<polygon fill="#000000" stroke="#000000" points="669.8349,-84.154 679.7797,-80.5 669.7269,-77.1548 669.8349,-84.154"/>
+</g>
+<!-- c25 -->
+<g id="node11" class="node">
+<title>c25</title>
+<polygon fill="none" stroke="#000000" points="849.2625,-131.5 849.2625,-175.5 950.9178,-175.5 950.9178,-131.5 849.2625,-131.5"/>
+<text text-anchor="middle" x="862.3177" y="-160.3" font-family="Times,serif" font-size="14.00" fill="#000000">A</text>
+<polyline fill="none" stroke="#000000" points="849.2625,-153.5 875.3729,-153.5 "/>
+<text text-anchor="middle" x="862.3177" y="-138.3" font-family="Times,serif" font-size="14.00" fill="#000000">B</text>
+<polyline fill="none" stroke="#000000" points="875.3729,-131.5 875.3729,-175.5 "/>
+<text text-anchor="middle" x="900.0902" y="-156.3" font-family="Times,serif" font-size="14.00" fill="#000000">$56</text>
+<text text-anchor="middle" x="900.0902" y="-142.3" font-family="Times,serif" font-size="14.00" fill="#000000">$NaN</text>
+<polyline fill="none" stroke="#000000" points="924.8075,-131.5 924.8075,-175.5 "/>
+<text text-anchor="middle" x="937.8626" y="-149.3" font-family="Times,serif" font-size="14.00" fill="#000000">Y</text>
+</g>
+<!-- c47 -->
+<g id="node30" class="node">
+<title>c47</title>
+<polygon fill="none" stroke="#000000" points="986.9178,-131.5 986.9178,-167.5 1080.8006,-167.5 1080.8006,-131.5 986.9178,-131.5"/>
+<text text-anchor="middle" x="999.973" y="-145.3" font-family="Times,serif" font-size="14.00" fill="#000000">A</text>
+<polyline fill="none" stroke="#000000" points="1013.0282,-131.5 1013.0282,-167.5 "/>
+<text text-anchor="middle" x="1033.8592" y="-152.3" font-family="Times,serif" font-size="14.00" fill="#000000">$63</text>
+<text text-anchor="middle" x="1033.8592" y="-138.3" font-family="Times,serif" font-size="14.00" fill="#000000">$f2b</text>
+<polyline fill="none" stroke="#000000" points="1054.6903,-131.5 1054.6903,-167.5 "/>
+<text text-anchor="middle" x="1067.7454" y="-145.3" font-family="Times,serif" font-size="14.00" fill="#000000">Y</text>
+</g>
+<!-- c25->c47 -->
+<g id="edge18" class="edge">
+<title>c25:e->c47:w</title>
+<path fill="none" stroke="#000000" stroke-width="3" d="M950.9178,-153.5C962.9917,-153.5 968.1493,-151.25 976.7651,-150.125"/>
+<polygon fill="#000000" stroke="#000000" stroke-width="3" points="977.1518,-153.6079 986.9178,-149.5 976.7216,-146.6211 977.1518,-153.6079"/>
+</g>
+<!-- c26 -->
+<g id="node12" class="node">
+<title>c26</title>
+<polygon fill="none" stroke="#000000" points="849.2625,-68.5 849.2625,-112.5 950.9178,-112.5 950.9178,-68.5 849.2625,-68.5"/>
+<text text-anchor="middle" x="862.3177" y="-97.3" font-family="Times,serif" font-size="14.00" fill="#000000">A</text>
+<polyline fill="none" stroke="#000000" points="849.2625,-90.5 875.3729,-90.5 "/>
+<text text-anchor="middle" x="862.3177" y="-75.3" font-family="Times,serif" font-size="14.00" fill="#000000">B</text>
+<polyline fill="none" stroke="#000000" points="875.3729,-68.5 875.3729,-112.5 "/>
+<text text-anchor="middle" x="900.0902" y="-93.3" font-family="Times,serif" font-size="14.00" fill="#000000">$57</text>
+<text text-anchor="middle" x="900.0902" y="-79.3" font-family="Times,serif" font-size="14.00" fill="#000000">$NaN</text>
+<polyline fill="none" stroke="#000000" points="924.8075,-68.5 924.8075,-112.5 "/>
+<text text-anchor="middle" x="937.8626" y="-86.3" font-family="Times,serif" font-size="14.00" fill="#000000">Y</text>
+</g>
+<!-- c48 -->
+<g id="node31" class="node">
+<title>c48</title>
+<polygon fill="none" stroke="#000000" points="986.9178,-74.5 986.9178,-110.5 1080.8006,-110.5 1080.8006,-74.5 986.9178,-74.5"/>
+<text text-anchor="middle" x="999.973" y="-88.3" font-family="Times,serif" font-size="14.00" fill="#000000">A</text>
+<polyline fill="none" stroke="#000000" points="1013.0282,-74.5 1013.0282,-110.5 "/>
+<text text-anchor="middle" x="1033.8592" y="-95.3" font-family="Times,serif" font-size="14.00" fill="#000000">$68</text>
+<text text-anchor="middle" x="1033.8592" y="-81.3" font-family="Times,serif" font-size="14.00" fill="#000000">$f2b</text>
+<polyline fill="none" stroke="#000000" points="1054.6903,-74.5 1054.6903,-110.5 "/>
+<text text-anchor="middle" x="1067.7454" y="-88.3" font-family="Times,serif" font-size="14.00" fill="#000000">Y</text>
+</g>
+<!-- c26->c48 -->
+<g id="edge19" class="edge">
+<title>c26:e->c48:w</title>
+<path fill="none" stroke="#000000" stroke-width="3" d="M950.9178,-90.5C962.9363,-90.5 968.1632,-91.625 976.7859,-92.1875"/>
+<polygon fill="#000000" stroke="#000000" stroke-width="3" points="976.8146,-95.69 986.9178,-92.5 977.0305,-88.6933 976.8146,-95.69"/>
+</g>
+<!-- c27 -->
+<g id="node13" class="node">
+<title>c27</title>
+<polygon fill="none" stroke="#000000" points="1246.6834,-158.5 1246.6834,-202.5 1348.3387,-202.5 1348.3387,-158.5 1246.6834,-158.5"/>
+<text text-anchor="middle" x="1259.7386" y="-187.3" font-family="Times,serif" font-size="14.00" fill="#000000">A</text>
+<polyline fill="none" stroke="#000000" points="1246.6834,-180.5 1272.7938,-180.5 "/>
+<text text-anchor="middle" x="1259.7386" y="-165.3" font-family="Times,serif" font-size="14.00" fill="#000000">B</text>
+<polyline fill="none" stroke="#000000" points="1272.7938,-158.5 1272.7938,-202.5 "/>
+<text text-anchor="middle" x="1297.5111" y="-183.3" font-family="Times,serif" font-size="14.00" fill="#000000">$58</text>
+<text text-anchor="middle" x="1297.5111" y="-169.3" font-family="Times,serif" font-size="14.00" fill="#000000">$NaN</text>
+<polyline fill="none" stroke="#000000" points="1322.2284,-158.5 1322.2284,-202.5 "/>
+<text text-anchor="middle" x="1335.2835" y="-176.3" font-family="Times,serif" font-size="14.00" fill="#000000">Y</text>
+</g>
+<!-- c42 -->
+<g id="node25" class="node">
+<title>c42</title>
+<polygon fill="none" stroke="#000000" points="1384.3387,-162.5 1384.3387,-198.5 1478.2215,-198.5 1478.2215,-162.5 1384.3387,-162.5"/>
+<text text-anchor="middle" x="1397.3939" y="-176.3" font-family="Times,serif" font-size="14.00" fill="#000000">A</text>
+<polyline fill="none" stroke="#000000" points="1410.4491,-162.5 1410.4491,-198.5 "/>
+<text text-anchor="middle" x="1431.2801" y="-183.3" font-family="Times,serif" font-size="14.00" fill="#000000">$74</text>
+<text text-anchor="middle" x="1431.2801" y="-169.3" font-family="Times,serif" font-size="14.00" fill="#000000">$f2b</text>
+<polyline fill="none" stroke="#000000" points="1452.1112,-162.5 1452.1112,-198.5 "/>
+<text text-anchor="middle" x="1465.1663" y="-176.3" font-family="Times,serif" font-size="14.00" fill="#000000">Y</text>
+</g>
+<!-- c27->c42 -->
+<g id="edge15" class="edge">
+<title>c27:e->c42:w</title>
+<path fill="none" stroke="#000000" stroke-width="3" d="M1348.3387,-180.5C1360.3387,-180.5 1365.5887,-180.5 1374.2137,-180.5"/>
+<polygon fill="#000000" stroke="#000000" stroke-width="3" points="1374.3387,-184.0001 1384.3387,-180.5 1374.3387,-177.0001 1374.3387,-184.0001"/>
+</g>
+<!-- c28 -->
+<g id="node14" class="node">
+<title>c28</title>
+<polygon fill="none" stroke="#000000" points="1246.6834,-69.5 1246.6834,-113.5 1348.3387,-113.5 1348.3387,-69.5 1246.6834,-69.5"/>
+<text text-anchor="middle" x="1259.7386" y="-98.3" font-family="Times,serif" font-size="14.00" fill="#000000">A</text>
+<polyline fill="none" stroke="#000000" points="1246.6834,-91.5 1272.7938,-91.5 "/>
+<text text-anchor="middle" x="1259.7386" y="-76.3" font-family="Times,serif" font-size="14.00" fill="#000000">B</text>
+<polyline fill="none" stroke="#000000" points="1272.7938,-69.5 1272.7938,-113.5 "/>
+<text text-anchor="middle" x="1297.5111" y="-94.3" font-family="Times,serif" font-size="14.00" fill="#000000">$59</text>
+<text text-anchor="middle" x="1297.5111" y="-80.3" font-family="Times,serif" font-size="14.00" fill="#000000">$NaN</text>
+<polyline fill="none" stroke="#000000" points="1322.2284,-69.5 1322.2284,-113.5 "/>
+<text text-anchor="middle" x="1335.2835" y="-87.3" font-family="Times,serif" font-size="14.00" fill="#000000">Y</text>
+</g>
+<!-- c43 -->
+<g id="node26" class="node">
+<title>c43</title>
+<polygon fill="none" stroke="#000000" points="1384.3387,-82.5 1384.3387,-118.5 1478.2215,-118.5 1478.2215,-82.5 1384.3387,-82.5"/>
+<text text-anchor="middle" x="1397.3939" y="-96.3" font-family="Times,serif" font-size="14.00" fill="#000000">A</text>
+<polyline fill="none" stroke="#000000" points="1410.4491,-82.5 1410.4491,-118.5 "/>
+<text text-anchor="middle" x="1431.2801" y="-103.3" font-family="Times,serif" font-size="14.00" fill="#000000">$81</text>
+<text text-anchor="middle" x="1431.2801" y="-89.3" font-family="Times,serif" font-size="14.00" fill="#000000">$f2b</text>
+<polyline fill="none" stroke="#000000" points="1452.1112,-82.5 1452.1112,-118.5 "/>
+<text text-anchor="middle" x="1465.1663" y="-96.3" font-family="Times,serif" font-size="14.00" fill="#000000">Y</text>
+</g>
+<!-- c28->c43 -->
+<g id="edge16" class="edge">
+<title>c28:e->c43:w</title>
+<path fill="none" stroke="#000000" stroke-width="3" d="M1348.3387,-91.5C1360.8369,-91.5 1365.5953,-96.6685 1374.3445,-99.172"/>
+<polygon fill="#000000" stroke="#000000" stroke-width="3" points="1373.9648,-102.6522 1384.3387,-100.5 1374.8869,-95.7132 1373.9648,-102.6522"/>
+</g>
+<!-- c29 -->
+<g id="node15" class="node">
+<title>c29</title>
+<polygon fill="none" stroke="#000000" points="1644.1043,-147.5 1644.1043,-191.5 1745.7596,-191.5 1745.7596,-147.5 1644.1043,-147.5"/>
+<text text-anchor="middle" x="1657.1595" y="-176.3" font-family="Times,serif" font-size="14.00" fill="#000000">A</text>
+<polyline fill="none" stroke="#000000" points="1644.1043,-169.5 1670.2147,-169.5 "/>
+<text text-anchor="middle" x="1657.1595" y="-154.3" font-family="Times,serif" font-size="14.00" fill="#000000">B</text>
+<polyline fill="none" stroke="#000000" points="1670.2147,-147.5 1670.2147,-191.5 "/>
+<text text-anchor="middle" x="1694.932" y="-172.3" font-family="Times,serif" font-size="14.00" fill="#000000">$60</text>
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+<!-- c44 -->
+<g id="node27" class="node">
+<title>c44</title>
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+<!-- c29->c44 -->
+<g id="edge17" class="edge">
+<title>c29:e->c44:w</title>
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+<!-- c30 -->
+<g id="node16" class="node">
+<title>c30</title>
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+<text text-anchor="middle" x="540.7245" y="-79.3" font-family="Times,serif" font-size="14.00" fill="#000000">Y</text>
+</g>
+<!-- c30->n21 -->
+<g id="edge25" class="edge">
+<title>c30:e->n21:w</title>
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+<!-- c31 -->
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+</g>
+<!-- c31->n7 -->
+<g id="edge34" class="edge">
+<title>c31:e->n7:w</title>
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+<!-- n6 -->
+<g id="node33" class="node">
+<title>n6</title>
+<ellipse fill="#000000" stroke="#000000" cx="422.0969" cy="-87.5" rx="1.8" ry="1.8"/>
+</g>
+<!-- x1->n6 -->
+<g id="edge30" class="edge">
+<title>x1:e->n6:w</title>
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+<polygon fill="#000000" stroke="#000000" points="411.75,-93.761 420.2969,-87.5 409.711,-87.0645 411.75,-93.761"/>
+</g>
+<!-- x3->n6 -->
+<g id="edge31" class="edge">
+<title>x3:e->n6:w</title>
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+<polygon fill="#000000" stroke="#000000" points="410.3521,-91.154 420.2969,-87.5 410.2441,-84.1548 410.3521,-91.154"/>
+</g>
+<!-- x5->n6 -->
+<g id="edge32" class="edge">
+<title>x5:e->n6:w</title>
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+<polygon fill="#000000" stroke="#000000" points="409.7082,-87.8613 420.2969,-87.5 411.794,-81.1793 409.7082,-87.8613"/>
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+<!-- c38 -->
+<g id="node21" class="node">
+<title>c38</title>
+<polygon fill="none" stroke="#000000" points="1116.8006,-84.5 1116.8006,-120.5 1210.6834,-120.5 1210.6834,-84.5 1116.8006,-84.5"/>
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+<text text-anchor="middle" x="1197.6283" y="-98.3" font-family="Times,serif" font-size="14.00" fill="#000000">Y</text>
+</g>
+<!-- c38->c28 -->
+<g id="edge42" class="edge">
+<title>c38:e->c28:w</title>
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+<!-- c39 -->
+<g id="node22" class="node">
+<title>c39</title>
+<polygon fill="none" stroke="#000000" points="1514.2215,-162.5 1514.2215,-198.5 1608.1043,-198.5 1608.1043,-162.5 1514.2215,-162.5"/>
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+<text text-anchor="middle" x="1595.0492" y="-176.3" font-family="Times,serif" font-size="14.00" fill="#000000">Y</text>
+</g>
+<!-- c39->c29 -->
+<g id="edge8" class="edge">
+<title>c39:e->c29:w</title>
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+</g>
+<!-- c40 -->
+<g id="node23" class="node">
+<title>c40</title>
+<polygon fill="none" stroke="#000000" points="1116.8006,-139.5 1116.8006,-175.5 1210.6834,-175.5 1210.6834,-139.5 1116.8006,-139.5"/>
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+<text text-anchor="middle" x="1197.6283" y="-153.3" font-family="Times,serif" font-size="14.00" fill="#000000">Y</text>
+</g>
+<!-- c40->c27 -->
+<g id="edge9" class="edge">
+<title>c40:e->c27:w</title>
+<path fill="none" stroke="#000000" stroke-width="3" d="M1210.6834,-157.5C1223.4643,-157.5 1227.8627,-164.3914 1236.5834,-167.7294"/>
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+</g>
+<!-- c41 -->
+<g id="node24" class="node">
+<title>c41</title>
+<polygon fill="none" stroke="#000000" points="1514.2215,-99.5 1514.2215,-135.5 1608.1043,-135.5 1608.1043,-99.5 1514.2215,-99.5"/>
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+<text text-anchor="middle" x="1595.0492" y="-113.3" font-family="Times,serif" font-size="14.00" fill="#000000">Y</text>
+</g>
+<!-- c41->c29 -->
+<g id="edge14" class="edge">
+<title>c41:e->c29:w</title>
+<path fill="none" stroke="#000000" stroke-width="3" d="M1608.1043,-117.5C1628.1861,-117.5 1623.0657,-145.6174 1634.4842,-155.2828"/>
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+</g>
+<!-- c42->c39 -->
+<g id="edge28" class="edge">
+<title>c42:e->c39:w</title>
+<path fill="none" stroke="#000000" d="M1478.2215,-180.5C1490.2215,-180.5 1495.4715,-180.5 1504.0965,-180.5"/>
+<polygon fill="#000000" stroke="#000000" points="1504.2215,-184.0001 1514.2215,-180.5 1504.2215,-177.0001 1504.2215,-184.0001"/>
+</g>
+<!-- c43->c41 -->
+<g id="edge29" class="edge">
+<title>c43:e->c41:w</title>
+<path fill="none" stroke="#000000" d="M1478.2215,-100.5C1491.9069,-100.5 1495.3733,-110.6695 1504.4282,-115.2775"/>
+<polygon fill="#000000" stroke="#000000" points="1503.6949,-118.7 1514.2215,-117.5 1505.2441,-111.8736 1503.6949,-118.7"/>
+</g>
+<!-- c44->c31 -->
+<g id="edge7" class="edge">
+<title>c44:e->c31:w</title>
+<path fill="none" stroke="#000000" d="M1875.6424,-182.5C1890.4758,-182.5 1892.5161,-196.5381 1901.7525,-202.6797"/>
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+<!-- n8 -->
+<g id="node34" class="node">
+<title>n8</title>
+<ellipse fill="#000000" stroke="#000000" cx="811.4625" cy="-164.5" rx="1.8" ry="1.8"/>
+</g>
+<!-- c45->n8 -->
+<g id="edge38" class="edge">
+<title>c45:e->n8:w</title>
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+<!-- n12 -->
+<g id="node32" class="node">
+<title>n12</title>
+<ellipse fill="#000000" stroke="#000000" cx="811.4625" cy="-79.5" rx="1.8" ry="1.8"/>
+</g>
+<!-- c46->n12 -->
+<g id="edge10" class="edge">
+<title>c46:e->n12:w</title>
+<path fill="none" stroke="#000000" stroke-width="3" d="M773.6625,-80.5C785.6672,-80.5 790.9114,-79.9375 799.5358,-79.6563"/>
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+<!-- c47->c38 -->
+<g id="edge23" class="edge">
+<title>c47:e->c38:w</title>
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+<polygon fill="#000000" stroke="#000000" points="1108.3665,-108.9122 1116.8006,-102.5 1106.2087,-102.2531 1108.3665,-108.9122"/>
+</g>
+<!-- c48->c40 -->
+<g id="edge27" class="edge">
+<title>c48:e->c40:w</title>
+<path fill="none" stroke="#000000" d="M1080.8006,-92.5C1109.6964,-92.5 1090.3033,-142.2656 1107.1268,-154.707"/>
+<polygon fill="#000000" stroke="#000000" points="1106.2222,-158.0887 1116.8006,-157.5 1108.1639,-151.3634 1106.2222,-158.0887"/>
+</g>
+<!-- n12->c26 -->
+<g id="edge11" class="edge">
+<title>n12:e->c26:w</title>
+<path fill="none" stroke="#000000" stroke-width="3" d="M813.2625,-79.5C827.9119,-79.5 830.1995,-92.9277 839.4406,-98.8024"/>
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+</g>
+<!-- n12->c26 -->
+<g id="edge12" class="edge">
+<title>n12:e->c26:w</title>
+<path fill="none" stroke="#000000" stroke-width="3" d="M813.2625,-79.5C825.2625,-79.5 830.5125,-79.5 839.1375,-79.5"/>
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+<!-- n12->c28 -->
+<g id="edge13" class="edge">
+<title>n12:e->c28:w</title>
+<path fill="none" stroke="#000000" stroke-width="3" d="M813.2625,-79.5C831.5659,-79.5 831.5444,-64.0912 849.2625,-59.5 892.9982,-48.167 905.7497,-58.4573 950.9178,-59.5 1066.5572,-62.1696 1095.68,-63.0982 1210.6834,-75.5 1222.7288,-76.799 1227.8697,-78.962 1236.5021,-79.9623"/>
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+<!-- n6->c30 -->
+<g id="edge33" class="edge">
+<title>n6:e->c30:w</title>
+<path fill="none" stroke="#000000" d="M423.8969,-87.5C435.9708,-87.5 441.1284,-85.25 449.7442,-84.125"/>
+<polygon fill="#000000" stroke="#000000" points="450.1309,-87.6079 459.8969,-83.5 449.7007,-80.6211 450.1309,-87.6079"/>
+</g>
+<!-- n8->c25 -->
+<g id="edge39" class="edge">
+<title>n8:e->c25:w</title>
+<path fill="none" stroke="#000000" stroke-width="3" d="M813.2625,-164.5C825.2625,-164.5 830.5125,-164.5 839.1375,-164.5"/>
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+</g>
+<!-- n8->c25 -->
+<g id="edge40" class="edge">
+<title>n8:e->c25:w</title>
+<path fill="none" stroke="#000000" stroke-width="3" d="M813.2625,-164.5C827.9119,-164.5 830.1995,-151.0723 839.4406,-145.1976"/>
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+<!-- n8->c27 -->
+<g id="edge41" class="edge">
+<title>n8:e->c27:w</title>
+<path fill="none" stroke="#000000" stroke-width="3" d="M813.2625,-164.5C831.7858,-164.5 831.4182,-180.531 849.2625,-185.5 1016.1156,-231.9628 1068.0099,-193.0829 1236.4752,-191.5464"/>
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+n2 [ shape=point ];
+c18:p13:e -> n2:w [color="black", label=""];
+n2:e -> x0:s0:w [color="black", label=""];
+n2:e -> x2:s0:w [color="black", label=""];
+n2:e -> x4:s0:w [color="black", label=""];
+n3 [ shape=point ];
+c26:p13:e -> n3:w [color="black", style="setlinewidth(3)", label=""];
+n3:e -> c14:p11:w [color="black", style="setlinewidth(3)", label=""];
+n3:e -> c14:p12:w [color="black", style="setlinewidth(3)", label=""];
+n3:e -> c16:p11:w [color="black", style="setlinewidth(3)", label=""];
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+c17:p13:e -> c18:p12:w [color="black", style="setlinewidth(3)", label=""];
+n8:e -> c23:p20:w [color="black", label=""];
+n8:e -> c24:p20:w [color="black", label=""];
+n8:e -> c25:p20:w [color="black", label=""];
+n9:e -> c26:p11:w [color="black", label=""];
+}
--- /dev/null
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+<title>n2:e->x2:w</title>
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+<g id="edge18" class="edge">
+<title>n2:e->x4:w</title>
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+<title>x0:e->c23:w</title>
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+<g id="edge3" class="edge">
+<title>x2:e->c24:w</title>
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+<text text-anchor="middle" x="255.6757" y="-225.3" font-family="Times,serif" font-size="14.00" fill="#000000">Q</text>
+</g>
+<!-- x4->c25 -->
+<g id="edge5" class="edge">
+<title>x4:e->c25:w</title>
+<path fill="none" stroke="#000000" d="M115.2582,-218.5C119.3352,-218.5 122.7761,-218.5 126.8564,-218.5"/>
+<polygon fill="none" stroke="#000000" points="115.0414,-218.5001 109.0414,-222.5 103.0414,-218.5 109.0414,-214.5 115.0414,-218.5001"/>
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+<g id="edge2" class="edge">
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+<g id="node18" class="node">
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+<g id="edge4" class="edge">
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+<g id="node19" class="node">
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+<g id="edge6" class="edge">
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+<path fill="none" stroke="#000000" d="M98.3207,-328.5C137.376,-328.5 103.6932,-256.2266 129.1101,-242.6753"/>
+<polygon fill="#000000" stroke="#000000" points="130.0219,-246.0586 139.0414,-240.5 128.5241,-239.2207 130.0219,-246.0586"/>
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+<text text-anchor="middle" x="385.5585" y="-51.3" font-family="Times,serif" font-size="14.00" fill="#000000">Y</text>
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+<!-- n9->c26 -->
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+<polygon fill="#000000" stroke="#000000" points="294.7309,-59.0001 304.7309,-55.5 294.7308,-52.0001 294.7309,-59.0001"/>
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+<!-- n10 -->
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--- /dev/null
+CassieJones2020.pdf: nan-gates.md preamble.tex
+ pandoc --pdf-engine=xelatex -H preamble.tex nan-gates.md -o CassieJones2020.pdf
--- /dev/null
+---
+title: "NaN-Gate Synthesis and Hardware Deceleration"
+author: |
+ Cassie Jones
+ Witch of Light
+ list+sigbovik@witchoflight.com
+date: "1 April 2020"
+numbersections: true
+documentclass: article
+classoption:
+- twocolumn
+geometry: margin=1cm
+---
+
+# Abstract {-}
+
+In recent years there has been interest in the field of "hardware decelerators," which serve primarily to make computation more interesting rather than more efficient.
+This builds off the work of "NaN-Gates and Flip-FLOPS" [9] to provide a hardware synthesis implementation of real-number computational logic using the Yosys Open Synthesis Suite [1] framework, and evaluates the impacts of different floating point formats.
+
+**ACH Reference Format:**
+Cassie Jones.
+2020.
+NaN-Gate Synthesis and Hardware Deceleration.
+In *Proceedings of SIGBOVIK 2020*, Pittsburgh, PA, USA, April 1, 2020.
+(SIGBOVIK '20, ACH).
+
+# Introduction {-}
+
+Harware decelerators work on the principle of "stop and smell the roses."
+There are some qualities that are more important than sheer efficiency, and often these improvements can often only be realized by taking the computer and slowing it down to a more leisurely pace.
+The largest advancements in the field happen in the emulation space, since it's the most widely accessible.
+It may be most familiar in the form of video-game computers, building computers out of redstone in Minecraft, Factorio combinators, or the like [7] [6].
+
+> "But of course speed is not what we're after here. We're after just, beautiful computation going on inside the heart of this machine." --- Tom7 [10]
+
+The SIGBOVIK 2019 paper "NaN-Gates and Flip-FLOPS" decelerates computers in the name of elegance: it throws away the assumption of binary computers and builds ones based on real numbers, specifically IEEE-754 floating point numbers.
+It aims towards "reboot computing using the beautiful foundation of real numbers," but it still leaves us with room for improvement in a few areas.
+It leaves the logic gates in the domain of emulation, which limits the types of hardware that are easy to build, and it limits the elegance that can be achieved.
+By using an existing CPU as the floating point processor, you still have a computer that's based on binary emulating your real number logic.
+
+Here, we attempt to remove this limitation by bringing NaN-gate computation to the domain of native hardware, via a custom Yosys synthesis pass.
+
+# NaN-Gate Synthesis
+
+The Yosys Open SYnthesis Suite [1] is a free and open source archicture-neutral logic synthesis framework.
+It can synthesize Verilog into a variety of backend formats using a flexible and pluggable architecture of passes.
+The Yosys manual has a chapter on how to write extensions [2, Ch. 6], which can be consulted for documentation and examples on how Yosys passes are built.
+We provide a Yosys extension which synthesizes a circuit down to a network of small floating point units implementing the NaN-gate function.
+This can be further synthesized to a final target, like a specific FPGA architecture.
+
+## Yosys Synthesis
+
+We will demonstrate all synthesis with the following toggle module, since it's small enough for all stages of synthesis results to be understandable and fit neatly on the page.
+
+```verilog
+module toggle(input clk, input en, output out);
+
+always @(posedge clk) begin
+ if (en) out <= ~out;
+end
+
+endmodule
+```
+
+Yosys will take a Verilog module like this and flatten the procedural blocks into circuits with memory elements.
+Running sythesis gives us a circuit with a flip-flop, a toggle, and a multiplexer that's driven by the enable line.
+
+
+
+We can also ask yosys to synthesize this to exclusively NAND and NOT gates with a small synthesis script.
+
+```tcl
+read_verilog toggle.v
+synth
+abc -g NAND
+```
+
+This particular design synthesizes to 1 D flip-flop, 3 NAND gates, and 2 NOT gates.
+
+
+
+## The Yosys `synth_nan` Pass
+
+Our `synth_nan` pass is implemented as a Yosys extension.
+For convenience, we'll describe the behavior in terms of the 3-bit float synthesis.
+It converts a module to NaN-gate logic.
+It summarizes itself as running:
+
+```tcl
+synth
+abc -g NAND
+nand_to_nan
+share_nan
+dff_nan
+simplify_nan
+clean
+techmap_nan
+```
+
+The first two steps there are standard synthesis.
+The `synth` pass will convert a module into coarsly optimized circuits, and `abc -g NAND` will remap the entire thing into optimized NAND logic.
+
+One complexity we have to deal with is external interfaces.
+Despite the wonderful realms of pure real-number computation we want to interact with, when interacting with fixed hardware component interfaces, we have to convert between flots and bits.
+In order to handle this, the NaN gate tech library has modules like `fp3_to_bit` and `bit_to_fp3` which perform this boundary conversion.
+In order to deal with the chaotic diversity of real circuits, for robustness, the `nand_to_nan` pass converts each NAND gate to a `bit_to_fp3 -> NaN -> fp3_to_bit` chain.
+Don't worry, these conversions will later be removed everywhere they don't turn out to be necessary.
+
+
+
+The `share_nan` pass reduces the number of conversions by sharing ones that have the same inputs.
+Then, the `dff_nan` pass can expand the flip-flops in the circuit into a set of enough flip-flops to store the floating point values.
+
+The `simplify_nan` pass converts any instance of `fp3_to_bit -> bit_to_fp3` to just a wire that passes the floats straight through.
+
+We do `clean` to remove dead wires and useless buffers, and then finally the `techmap_nan` pass replaces the opaque NaN-gate modules with actual modules so that further synthesis can properly make them realizable on real hardware.
+
+## Module Ports
+
+If you want your circuit to support external floating-point based interfaces, you can use the floating point conversion modules yourself.
+
+```verilog
+module toggle(
+ input clk, input [2:0] en, output [2:0] out);
+
+wire en_b;
+reg out_b;
+fp3_to_bit en_cvt(en, en_b);
+bit_to_fp3 out_cvt(out_b, out);
+always @(posedge clk) begin
+ if (en_b) out_b = ~out_b;
+end
+
+endmodule
+```
+
+The NaN synthesis will end up erasing the floating point conversions on either side of the interface since they connect to floating point units.
+Future work could include automatically expanding ports using something like a `(* nan_port *)` attribute.
+
+# Floating Point Formats
+
+While tom7's work asserts that a **binary4** floating point format is "clearly allowed by the IEEE-754 standard," this doesn't seem to hold up under a close examination.
+Brought to my attention by Steve Canon [8], there are two cases where these floating point formats fall down.
+First, and most importantly in the case of **binary4**, you need to encode both quiet- and signaling-NaNs.
+Section 3.3 of IEEE-754 says [5]:
+
+> "Within each format, the following floating-point data shall be represented: [...] Two NaNs, qNaN (quiet) and sNaN (signaling)."
+
+While **binary4** does have two separate NaN values (a positive and a negative), they are distinguished only by their sign bit, which isn't allowed to distinguish the two types of NaNs, as we can see in 6.2.1:
+
+> "When encoded, all NaNs have a sign bit and a pattern of bits necessary to identify the encoding as a NaN and which determines its kind (sNaN vs. qNaN)."
+
+\newpage
+\begin{figure*}
+\centering
+\includegraphics[width=7in]{figures/synthesis-pass.pdf}
+\caption{The full NaN-gate synthesis process for the toggle module. In step 1 we have the logical circuit after coarse synthesis. In step 2 it's synthesized to NAND and NOT gates. Step 3 converts the gates to NaN gates and adds conversion chains. Step 4 expands the flip-flops to store floats. Step 5 collapses redundant conversion chains to give the final NaN-synthesized module.}
+\end{figure*}
+\clearpage
+
+This means that we need at least two bits in the mantissa in order to represent the infinities (stored as a 0 mantissa with the maximum exponent) and the NaN values (stored with two distinct non-zero mantissas).
+
+![From Steve Canon's tweet [8]. As the cat says, since IEEE-754 requires $emax$ to be greater than $emin$, there must be two exponent bits, and since the mantissa must be used to distinguish sNaN, qNaN, and infinity, so it also needs at least two bits, leading to a minimum of 5-bit floats.](binary5.jpg)
+
+The **binary3** format is further disrupted in section 3.3, which rules-out the idea of having an empty range of $emin$ and $emax$, since they're used in an inequality and $emin \le emax$, and is elsewhere forced to be strictly less by other constraints:
+
+> "$q$ is any integer $emin \le q+p-1 \le emax$" 3.3
+
+Still, the **binary3** format is very useful for efficient implementation of NaN gates, and is worth including in synthesis for people who aren't bothered by standards compliance.
+For completeness, the `synth_nan` implementation supports synthesis to **binary3**, **binary4**, and the definitely-IEEE-754-compliant **binary5** format NaN-gates.
+Furthermore, the architecture would support easy extensions to larger, more conventional floating point formats like **binary8**, or even larger, by simply loading your own libary of modules named `nan_fpN`, `bit_to_fpN`, and `fpN_to_bit`, for any value of `N` you want to synthesize with.
+
+## The binary5 Representation
+
+Here we document the representation in the **binary5** format, the smallest legal IEEE-754 compliant binary floating-point format.
+It has a sign bit, a two bit exponent, and a two bit mantissa.
+We include a table of all of the positive values here:
+
+s E T value
+- -- -- -----
+0 00 00 +0.0
+0 00 01 +0.25
+0 00 10 +0.5
+0 00 11 +0.75
+0 01 00 +1.0
+0 01 01 +1.25
+0 01 10 +1.5
+0 01 11 +1.75
+0 10 00 +2.0
+0 10 01 +2.5
+0 10 10 +3.0
+0 10 11 +3.5
+0 11 00 +inf
+0 11 01 sNaN
+0 11 10 qNaN
+0 11 11 qNaN
+
+<!-- @TODO: Make table captions work -->
+The positive values representable in the **binary5** format. Note that infinity, sNaN, and qNaN are all distinguished by the mantissa value when the exponent is all ones, so this is the smallest possible floating point format. The negative values for each are the same bit patterns but with a 1 in the sign bit.
+
+## Evaluation
+
+We compare the size (in both logic and memory elements) and clock speed of modules synthesized with the different floating points.
+For the benchmark, we use a pipelined 32-bit multiplier, and the PicoRV32 processor [3] synthesized for the ECP5 architecture, and placed and routed using nextpnr [4].
+The numbers given for clock frequency are the best result of 10 runs of placement and routing.
+
+<!-- @TODO: Actually run 10 times -->
+
+The "NAND" variant are synthesized to NAND gates before architecture-specific optimization, in order to obscure some of the higher-level modules that are present in the original design and prevent optimizations that won't be available to the NaN-gate synthesis.
+This gives a clearer baseline for comparison with the NaN gates, and so this is used as the basis for relative numbers.
+Times marked **DNP** are those that did not successfully place and route for timing analysis, so no frequency can be reported.
+
+Design Variant Cells Cell% DFFs DFF% (MHz)
+------ ------- ------ ------ ------ ----- -------
+PicoRV Direct 1884 57% 888 48% 103.55
+ NAND 3328 100% 1848 100% 47.30
+ fp3 43739 1314% 5544 299% **DNP**
+ fp4 32853 987% 7392 400% **DNP**
+ fp5 65511 1968% 9240 500% **DNP**
+Mult32 Direct 2879 104% 628 100% 143.04
+ NAND 2773 100% 628 100% 154.37
+ fp3 25349 880% 1884 300% 25.26
+ fp4 19026 661% 2520 400% 21.88
+ fp5 38001 1320% 3140 500% 21.18
+
+It's interesting that fp4 is the smallest of the floating point variants in logic, even though not in memory.
+It seems likely that this is because the ECP5 architecture is based on a "LUT4" architecture, 4-input lookup tables, which means the individual NaN-gates potentially happen to synthesize more efficiently with 4-bit inputs.
+
+## Flattening
+
+For this benchmark, we synthesize designs without flattening post NaN-gate synthesis, because the optimizer is too effective and eliminates most of the floating point logic.
+When they are flattened, the optimzer can consider the logic involved in the individual NaN gates and re-combine them into and erase constant-value flip-flops.
+Designs that are flattened before optimizing have no flip-flop overhead, and have on the order of 5% overhead in logic elements vs the reference NAND-gate versions.
+
+While synthesizing with post-NaN flattening substantially undermines the floating point logic and mostly demonstrates the impressive quality of Yosys's optimizations, it suggests as an option a sort of "homeopathic floating-point logic."
+For users that require efficiency but still want *some* of the elegance benefits, they can flatten it and optimize it away, keeping some peace-of-mind in knowing that their final circuit is derived from an elegant real-number system, regardless of how it currently behaves.
+
+# Future Work
+
+Floating point synthesis still has many avenues for improvement and future work.
+
+The current synthesis approach used by `synth_nan` remains fragile in the face of flattening and pass-ordering.
+It should be possible to make it harder to accidentally flatten the designs away into nothing, but they still do need to be eventually flattened since the `nextpnr` place-and-route flow is still not fully reliable in the presence of un-flattened designs.
+Currently the `synth_nan` pass must be run before any device-specific passes, which can be fine but it prevents the utilization of resources such as distributed RAMs.
+
+Float synthesis tools should make it easier to define module ports that should be expanded to accomodate floating-point based signals, so that designs can operate fully in the glorious domain of the real numbers, without having to flatten all designs.
+
+More work could be done into ensuring that the individual gates are properly optimized for different architectures, since it seems unreasonable for fp4 to remain more efficient than fp3.
+The system could also benefit from implementing a larger set of primitive gates, to avoid the blowup of using NAND gates to emulate everything, since they should be implementable in similar amounts of elementary logic.
+
+With **binary5** and larger, there looks like there could be potential in attempting to explore designs that work *purely* on NaN values, exploring the flexibility in the handling of signaling and quiet NaN values.
+
+The NaN-gate synthesis plugin for Yosys can be found at <https://git.witchoflight.com/nan-gate>.
+This paper and the examples materials in it can be found at <https://git.witchoflight.com/sigbovik-nan-2020>.
+
+\begingroup
+# References {-}
+\setlength{\parindent}{-0.2in}
+\setlength{\leftskip}{0.2in}
+\setlength{\parskip}{8pt}
+
+\vspace{-20pt}
+\indent{}
+[1] Claire Wolf.
+ The Yosys Open SYnthesis Suite.
+ Online.
+\noindent{}
+ http://www.clifford.at/yosys/
+
+[2] Claire Wolf.
+ The Yosys Manual.
+ Online.
+\noindent{}
+ http://www.clifford.at/yosys/files/yosys_manual.pdf
+
+[3] Claire Wolf.
+ PicoRV32 - A Size Optimized RISC-V CPU.
+ Online.
+ https://github.com/cliffordwolf/picorv32
+
+[4] Claire Wolf, David Shah, Dan Gisselquist, Serge Bazanski, Miodrag Milanovic, and Eddie Hung.
+ NextPNR Portable FPGA Place and Route Tool.
+ 2018.
+ Online.
+\noindent{}
+ https://github.com/YosysHQ/nextpnr
+
+[5] IEEE Standard for Floating-Point Artithmetic.
+ 2019.
+ In *IEEE Std 754-2019 (Revision of IEEE 754-2008).*
+ Pages 1--84.
+ DOI 10.1109/IEEESTD.2019.8766229.
+
+[6] justarandomgeek.
+ 2017.
+ justarandomgeek's Combinator Computer Mk5.
+ Online.
+\noindent{}
+ https://github.com/justarandomgeek/factorio-computer
+
+[7] legomasta99.
+ 2018.
+ Minecraft Computer Engineering - Redstone Computers.
+ Online.
+<!--\noindent{}-->
+ https://www.youtube.com/watch?v=aj6IUuwLyOE
+ &list=PLwdt_GQ3o0Xe6pUS1vdzy0ZqXrApB2MNu
+
+[8] Stephen Canon.
+ 2017.
+ A Tweet About IEEE-754.
+ Tweet by \@stephentyrone on April 1, 2017.
+\noindent{}
+ https://twitter.com/stephentyrone/status/848172687268687873
+
+[9] Tom Murphy VII.
+ 2019.
+ NaN Gates and Flip FLOPS.
+ In *Proceedings of SIGBOVIK 2019*, Pittsburgh, PA, USA, April 1, 2019.
+ (SIGBOVIK '19, ACH).
+ Pages 98--102.
+
+[10] Tom Murphy VII.
+ 2019.
+ NaN Gates and Flip FLOPS.
+ Online.
+ http://tom7.org/nand/
--- /dev/null
+\usepackage{nopageno}
+\usepackage{xtab}
+\makeatletter
+\def\longtable{\@ifnextchar[\newlongtable@i \newlongtable@ii}
+\def\newlongtable@i[#1]{%
+\renewcommand{\endhead}{\ignorespaces}
+\begin{center}
+\xtabular[#1]}
+\def\newlongtable@ii{%
+\renewcommand{\endhead}{\ignorespaces}
+\xtabular}
+\def\endlongtable{\endxtabular\end{center}}
+\makeatother
projects / sigbovik-nan-2020 / commitdiff
