5 + 5 + 5 - 3 x 5, 3 groups of 4 - 3 x 4, 2 + 2 + 2 + 2 - 4 x 2, 2 groups of 4 - 2 x 4, 3 + 3 + 3 - 3 x 3, 2 groups of 6 - 2 x 6,

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