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Pyramid 1381
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$$U_{1381}(x, y) = \frac{1}{\left(1 - y\right)^{2} \sqrt{- \frac{4 x}{1 - y} + 1}}$$
Pyramid 1382
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$$U_{1382}(x, y) = \frac{1}{\left(1 - y\right)^{3} \sqrt{- \frac{4 x}{1 - y} + 1}}$$
Pyramid 1383
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$$U_{1383}(x, y) = \frac{1}{\left(1 - y\right)^{2} \sqrt{- \frac{4 x}{\left(1 - y\right)^{3}} + 1}}$$
Pyramid 1384
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$$U_{1384}(x, y) = \frac{1}{\left(1 - y\right)^{3} \sqrt{- \frac{4 x}{\left(1 - y\right)^{2}} + 1}}$$
Pyramid 1385
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$$U_{1385}(x, y) = \frac{1}{\sqrt{1 - 4 x} \left(1 - y\right)^{2}}$$
Pyramid 1386
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$$U_{1386}(x, y) = \frac{1}{\sqrt{1 - 4 x} \left(1 - y\right)^{3}}$$
Pyramid 1387
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$$U_{1387}(x, y) = \frac{1}{\left(1 - y\right)^{2} \sqrt{- \frac{4 x}{\left(1 - y\right)^{2}} + 1}}$$
Pyramid 1388
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$$U_{1388}(x, y) = \frac{1}{\left(1 - y\right) \sqrt{- \frac{4 x}{\left(1 - y\right)^{3}} + 1}}$$
Pyramid 1389
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$$U_{1389}(x, y) = \frac{1}{\left(1 - y\right)^{3} \sqrt{- \frac{4 x}{\left(1 - y\right)^{3}} + 1}}$$
Pyramid 1390
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$$U_{1390}(x, y) = \frac{y}{1 - x} + 1$$
Pyramid 1391
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$$U_{1391}(x, y) = \frac{\frac{y}{1 - x} + 1}{\left(1 - x\right)^{2}}$$
Pyramid 1392
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$$U_{1392}(x, y) = \frac{\frac{y}{1 - x} + 1}{\left(1 - x\right)^{3}}$$
Pyramid 1393
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$$U_{1393}(x, y) = \frac{\frac{y}{\left(1 - x\right)^{2}} + 1}{\left(1 - x\right)^{3}}$$
Pyramid 1394
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$$U_{1394}(x, y) = \frac{\frac{y}{\left(1 - x\right)^{3}} + 1}{1 - x}$$
Pyramid 1395
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$$U_{1395}(x, y) = \frac{\frac{y}{\left(1 - x\right)^{3}} + 1}{\left(1 - x\right)^{2}}$$
Pyramid 1396
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$$U_{1396}(x, y) = \frac{\frac{y}{\left(1 - x\right)^{3}} + 1}{\left(1 - x\right)^{3}}$$
Pyramid 1397
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$$U_{1397}(x, y) = y \left(x + 1\right) + 1$$
Pyramid 1398
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$$U_{1398}(x, y) = \left(x + 1\right)^{2} \left(y \left(x + 1\right) + 1\right)$$
Pyramid 1399
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$$U_{1399}(x, y) = \left(x + 1\right)^{3} \left(y \left(x + 1\right) + 1\right)$$
Pyramid 1400
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$$U_{1400}(x, y) = y \left(x + 1\right)^{2} + 1$$
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