20 - 0 = - 20, 20 - 1 = - 19, 19 - 1 = - 18, 20 - 3 = - 17, 18 - 2 = - 16, 19 - 4 = - 15, 15 - 1 = - 14, 17 - 4 = - 13, 15 - 3 = - 12, 17 - 6 = - 11, 18 - 8 = - 10,

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