1+2=, 3, 0+1=, 1, 2+3=, 5, 3+4=, 7, 4+5=, 9, 5+6=, 11, 6+7=, 13, 7+8=, 15, 8+9=, 17, 9+10=, 19, 10+11=, 21

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