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

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