13 + 7 - 20, 6 + 9 - 15, 20 - 13 - 7, 14 - 9 - 5 , 5 + 6 - 11, 19 - 5 - 14, 9 + 9 - 18, 17 - 8 - 9, 2 + 1 - 3, 9 - 5 - 4,

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