16: 11 + 5, 18 - 2, 13 + 3, 19 - 3, 7 + 3 + 6, 20 - 2 -2, 12: 8 + 2 + 2, 15 - 3, 20 - 8, 16 - 1 -3, 17 - 5, 19 - 3 -4, 20: 10 + 4 + 6, 10 + 10, 13 + 7, 5 + 10 + 5, 21 - 1, 12 + 8,

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