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Pyramid 201
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$$U_{201}(x, y) = \frac{1}{- \frac{y}{\left(1 - x\right)^{2}} + \frac{1}{1 - x}}$$
Pyramid 202
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$$U_{202}(x, y) = \frac{y \left(x - 1\right)^{4} - 1}{x - 1}$$
Pyramid 203
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$$U_{203}(x, y) = \frac{2 x - \sqrt{y \left(- 4 x^{2} - 4 x\right) + 1} + 1}{2 x^{2} + 2 x}$$
Pyramid 204
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$$U_{204}(x, y) = - x + \frac{y}{\left(1 - x\right)^{2}} + 1$$
Pyramid 205
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$$U_{205}(x, y) = \frac{1 - \sqrt{1 - 4 y}}{2 y \left(1 - x\right)^{2}}$$
Pyramid 206
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$$U_{206}(x, y) = - \frac{1}{- x^{2} + 2 x + y \left(x^{4} - 4 x^{3} + 6 x^{2} - 4 x + 1\right) - 1}$$
Pyramid 207
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$$U_{207}(x, y) = \frac{y \left(x^{4} - 4 x^{3} + 6 x^{2} - 4 x + 1\right) + 1}{x^{2} - 2 x + 1}$$
Pyramid 208
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$$U_{208}(x, y) = y \left(x + 1\right) + \left(x + 1\right)^{2}$$
Pyramid 209
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$$U_{209}(x, y) = \frac{- x^{2} - 2 x - 1}{y \left(x + 1\right) - 1}$$
Pyramid 210
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$$U_{210}(x, y) = \frac{1 - \sqrt{y \left(- 4 x^{3} - 12 x^{2} - 12 x - 4\right) + 1}}{y \left(2 x + 2\right)}$$
Pyramid 211
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$$U_{211}(x, y) = \frac{1}{\sqrt{- 4 y + \left(1 - x\right)^{4}}}$$
Pyramid 212
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$$U_{212}(x, y) = \frac{1}{\sqrt{- \frac{4 y}{1 - x} + 1}}$$
Pyramid 213
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$$U_{213}(x, y) = \frac{1}{\sqrt{- y \left(4 x + 4\right) + 1}}$$
Pyramid 214
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$$U_{214}(x, y) = \frac{1}{\sqrt{- 4 y \left(x + 1\right)^{2} + 1}}$$
Pyramid 215
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$$U_{215}(x, y) = \frac{1}{\left(1 - x\right) \sqrt{1 - 4 y}}$$
Pyramid 216
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$$U_{216}(x, y) = \frac{\sqrt{1 - 4 y} - \sqrt{- 4 x \sqrt{1 - 4 y} - 4 y + 1}}{2 x \sqrt{1 - 4 y}}$$
Pyramid 217
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$$U_{217}(x, y) = \frac{1}{\left(1 - x\right)^{2} \sqrt{1 - 4 y}}$$
Pyramid 218
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$$U_{218}(x, y) = \frac{1 - \sqrt{1 - 4 x}}{2 x \sqrt{1 - 4 y}}$$
Pyramid 219
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$$U_{219}(x, y) = \frac{\left(y + 1\right) \left(- 2 x - \sqrt{1 - 4 x} + 1\right)}{2 x^{2}}$$
Pyramid 220
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$$U_{220}(x, y) = \frac{- 2 x - \sqrt{1 - 4 x} + 1}{2 x^{2} + y \left(2 x + \sqrt{1 - 4 x} - 1\right)}$$
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