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2a^2(a+c)^2 + 2(a+c)^2c^2 + 2c^2a^2 - (a^4 + (a+c)^4 + c^4)
2a^2(a+c)^2 + 2(a+c)^2c^2 + 2c^2a^2 - (a^4 + (a+c)^4 + c^4)
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