2 - 1 + 1 =, 4 - 2 + 2 =, 6 - 3 + 3 =, 8 - 4 + 4 =, 18 - 9 + 9 =, 14 - 7 + 7 =, 10 - 5 + 5 =, 12 - 6 + 6 =, 22 - 11 + 11 =, 26 - 13 + 13 =, 20 - 10 + 10 =, 28 - 14 + 14 =, 24 - 12 + 12 =, 30 - 15 + 15 =, 40 - 20 + 20 =, 34 - 17 + 17 =, 38 - 19 + 19 = , 32 - 16 + 16 =, 36 - 18 + 18 =, 0 - 0 + 0 =,

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