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

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