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    If I don’t make mistake the first example of the code in documentation ( https://paranoid-scientist.readthedocs.io/en/latest/ ) a failure to correct answer if x<-1 or 0<x<1 because in those case x**3 < x

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      the test is saying {if x >= y then x^3 >= y^3}, not {x^3 >= x}

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        I was wrong