"0+0", "0+0 = 0" "1+1", "1+1 = 2" "2+2", "2+2 = 4" "3+3", "3+3 = 6" "4+4", "4+4 = 8" "5+5", "5+5 = 10" "6+6", "6+6 = 12" "7+7", "7+7 = 14" "8+8", "8+8 = 16" "9+9", "9+9 = 18"
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