1, 1+0=, 2, 1+1=, 3, 1+2=, 4, 1+3=, 5, 1+4=, 6, 1+5=, 7, 1+6=, 8, 1+7=, 9, 1+8=, 10, 1+9=, 11, 9+2=, 12, 9+3=, 13, 9+4=, 14, 9+5=, 15, 9+6=, 16, 9+7=, 17, 9+8=, 18, 9+9=, 19, 9+10=, 20, 9+11=

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