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Pyramid 1501
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$$U_{1501}(x, y) = \frac{1}{\left(1 - 4 y\right) \left(- \frac{x}{\left(1 - 4 y\right)^{\frac{3}{2}}} + 1\right)}$$
Pyramid 1502
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$$U_{1502}(x, y) = \frac{1}{\left(1 - 4 y\right)^{\frac{3}{2}} \left(- \frac{x}{\left(1 - 4 y\right)^{\frac{3}{2}}} + 1\right)}$$
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