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

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