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Pyramid 921
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$$U_{921}(x, y) = \frac{\sqrt{- 4 x \left(y + 1\right) + 1} + 1}{2 y + 2}$$
Pyramid 922
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$$U_{922}(x, y) = \frac{y}{2} + \frac{\sqrt{\frac{4 x + y - 1}{y - 1}} \left(y - 1\right)}{2} - \frac{1}{2}$$
Pyramid 923
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$$U_{923}(x, y) = \frac{\sqrt{- 4 x y^{2} - 8 x y - 4 x + 1} + 1}{2 y^{2} + 4 y + 2}$$
Pyramid 924
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$$U_{924}(x, y) = \left(x + 1\right) \left(2 y + \sqrt{4 y^{2} + 1}\right)$$
Pyramid 925
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$$U_{925}(x, y) = \frac{- 2 y - \sqrt{4 y^{2} + 1}}{2 x y + x \sqrt{4 y^{2} + 1} - 1}$$
Pyramid 926
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$$U_{926}(x, y) = \frac{1 - \sqrt{- 32 x y^{2} - 16 x y \sqrt{4 y^{2} + 1} - 4 x + 1}}{4 x y + 2 x \sqrt{4 y^{2} + 1}}$$
Pyramid 927
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$$U_{927}(x, y) = \frac{i x + i}{\sqrt{4 x y + 4 y - 1}}$$
Pyramid 928
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$$U_{928}(x, y) = \sqrt{x^{2} + 4 x y + 2 x + 4 y + 1}$$
Pyramid 929
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$$U_{929}(x, y) = \frac{2 y + \sqrt{4 y^{2} + 1}}{1 - x}$$
Pyramid 930
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$$U_{930}(x, y) = \frac{1 - \sqrt{- 8 x y - 4 x \sqrt{4 y^{2} + 1} + 1}}{2 x}$$
Pyramid 931
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$$U_{931}(x, y) = \frac{\sqrt{- 8 x y - 4 x \sqrt{4 y^{2} + 1} + 1}}{2} + \frac{1}{2}$$
Pyramid 932
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$$U_{932}(x, y) = x \left(2 y + \sqrt{4 y^{2} + 1}\right) + 1$$
Pyramid 933
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$$U_{933}(x, y) = - \frac{1}{2 x y + x \sqrt{4 y^{2} + 1} - 1}$$
Pyramid 934
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$$U_{934}(x, y) = \frac{1 - \sqrt{- 8 x y - 4 x \sqrt{4 y^{2} + 1} + 1}}{4 x y + 2 x \sqrt{4 y^{2} + 1}}$$
Pyramid 935
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$$U_{935}(x, y) = \frac{2 x y - x \sqrt{- 4 x y + 4 y^{2} + 1} - 1}{4 x y - 1}$$
Pyramid 936
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$$U_{936}(x, y) = \sqrt{4 x + 4 y + 1}$$
Pyramid 937
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$$U_{937}(x, y) = 2 x + \sqrt{4 x^{2} + 4 y + 1}$$
Pyramid 938
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$$U_{938}(x, y) = 2 x + 2 y + \sqrt{4 x^{2} + 8 x y + 4 y^{2} + 1}$$
Pyramid 939
Preview
$$U_{939}(x, y) = \sqrt{4 x y + 4 x + 1}$$
Pyramid 940
Preview
$$U_{940}(x, y) = 2 x y + 2 x + \sqrt{4 x^{2} y^{2} + 8 x^{2} y + 4 x^{2} + 1}$$
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