2+2, 4, 4+4, 8, 5+5, 10, 1+1, 2, 3+3, 6, 6+6, 12, 7+7, 14, 8+8, 16, 9+9, 18, 10+10, 20, 2+3, 5, 3+4, 7, 4+5, 9, 5+6, 11, 6+7, 13, 7+8, 15, 8+9, 17, 22, 11+11, 24, 12+12.

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