2 + 2 - 4, 6 + 6 - 12, 0 + 0 - 0, 3 + 3 - 6, 12 + 12 - 24, 1 + 1 - 2, 8 + 8 - 16, 4 + 4 - 8, 7 + 7 - 14, 10 + 10 - 20, 11 + 11 - 22, 9 + 9 - 18, 5 + 5 - 10, 13 + 13 - 26,

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