1+1 - 2, 2+3 - 5, 5+5 - 10, 6+7 - 13, 6+6 - 12, 15+19 - 34, 18+60 - 78, 15+15 - 30, 15+14 - 29, 29+30 - 59, 100+100 - 200, 10+10 - 20, 7+7 - 14, 6+6 - 12, 100+13 - 113,

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