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Pyramid 1401
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$$U_{1401}(x, y) = \left(x + 1\right)^{2} \left(y \left(x + 1\right)^{2} + 1\right)$$
Pyramid 1402
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$$U_{1402}(x, y) = \left(x + 1\right)^{3} \left(y \left(x + 1\right)^{2} + 1\right)$$
Pyramid 1403
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$$U_{1403}(x, y) = y \left(x + 1\right)^{3} + 1$$
Pyramid 1404
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$$U_{1404}(x, y) = \left(x + 1\right) \left(y \left(x + 1\right)^{3} + 1\right)$$
Pyramid 1405
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$$U_{1405}(x, y) = \left(x + 1\right)^{2} \left(y \left(x + 1\right)^{3} + 1\right)$$
Pyramid 1406
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$$U_{1406}(x, y) = \left(x + 1\right)^{3} \left(y \left(x + 1\right)^{3} + 1\right)$$
Pyramid 1407
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$$U_{1407}(x, y) = \left(y + 1\right)^{3} \left(x \left(y + 1\right) + 1\right)$$
Pyramid 1408
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$$U_{1408}(x, y) = \left(y + 1\right)^{3} \left(x \left(y + 1\right)^{2} + 1\right)$$
Pyramid 1409
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$$U_{1409}(x, y) = \left(y + 1\right) \left(x \left(y + 1\right)^{3} + 1\right)$$
Pyramid 1410
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$$U_{1410}(x, y) = \left(y + 1\right)^{2} \left(x \left(y + 1\right)^{3} + 1\right)$$
Pyramid 1411
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$$U_{1411}(x, y) = \left(y + 1\right)^{3} \left(x \left(y + 1\right)^{3} + 1\right)$$
Pyramid 1412
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$$U_{1412}(x, y) = \frac{\frac{x}{1 - y} + 1}{\left(1 - y\right)^{2}}$$
Pyramid 1413
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$$U_{1413}(x, y) = \frac{\frac{x}{1 - y} + 1}{\left(1 - y\right)^{3}}$$
Pyramid 1414
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$$U_{1414}(x, y) = \frac{\frac{x}{\left(1 - y\right)^{3}} + 1}{1 - y}$$
Pyramid 1415
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$$U_{1415}(x, y) = \frac{\frac{x}{\left(1 - y\right)^{3}} + 1}{\left(1 - y\right)^{2}}$$
Pyramid 1416
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$$U_{1416}(x, y) = \frac{\frac{x}{\left(1 - y\right)^{2}} + 1}{\left(1 - y\right)^{3}}$$
Pyramid 1417
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$$U_{1417}(x, y) = \frac{1}{\left(1 - x\right)^{3} \left(- \frac{y}{1 - x} + 1\right)}$$
Pyramid 1418
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$$U_{1418}(x, y) = \frac{1}{\left(1 - x\right)^{3} \left(- \frac{y}{\left(1 - x\right)^{2}} + 1\right)}$$
Pyramid 1419
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$$U_{1419}(x, y) = \frac{1}{\left(1 - x\right)^{2} \left(- \frac{y}{\left(1 - x\right)^{3}} + 1\right)}$$
Pyramid 1420
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$$U_{1420}(x, y) = \frac{1}{\left(1 - x\right)^{3} \left(- \frac{y}{\left(1 - x\right)^{3}} + 1\right)}$$
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