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EXAMPLE
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{ -35780, 4693243, 11888132, 70993724 } is the smallest set of 4 numbers such that all 6 combinations of sum of any two numbers is a perfect cube. For example, -35780 + 70993724 = 414^3 and 4693243 + 11888132 = 255^3.
{ -13, 13, 14 } is the smallest set of 3 numbers where all 3 combinations of sum of any two numbers is a perfect cube.
{ -1, 1 } is the trivial set of two numbers because -1 + 1 = 0^3.
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