15: 11 + 4, 19 - 4, 18 - 3, 12 + 3, 17: 20 - 3, 12 + 5, 11 + 6, 19 - 2, 6: 18 - 12, 17 - 11, 20 - 14, 16 - 10, 11: 13 - 2, 19 - 8, 15 - 4, 10 + 1, 13: 11 + 2, 10 + 3, 19 - 6, 17 - 4, 5: 15 - 10, 18 - 13, 19 - 14, 20 - 15,

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