1+1=, 1, 2, 3, 4, 2+2 =, 1, 2, 3, 4, 3+3 =, 3, 6, 9, 12, 4+4=, 4, 6, 8, 10, 5+5=, 5, 9, 10, 15, 4+6=, 5, 10, 7, 9, 7+2=, 7, 9, 8, 6, 2+6=, 8, 1, 2, 6, 0+9=, 9, 8, 7, 6, 10+10=, 10, 20, 30, 40.

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