x1 2x1 x1 2x1 3x1 x2 x2 x2 x2 x2 x3 x3 x3 4x3 x3 3x4 x4
Chapter , Problem 50(choose chapter or problem)
x1 2x1 x1 2x1 3x1 x2 x2 x2 x2 x2 x3 x3 x3 4x3 x3 3x4 x4 2x4 x4 2x4 x5 x5 x5 x5 x5 3 4 3 1 5 x1 x1
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