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3125 a^2 + 4(1125 b^2 - 3200 b + 2048) a + 108 b^4(b-1) where a = 27 b^4 / 640
3125 a^2 + 4(1125 b^2 - 3200 b + 2048) a + 108 b^4(b-1) where a = 27 b^4 / 640
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