4 - 2+2=, 5 - 8-3=, 20 - 10+10=, 2 - 3-1=, 6 - 4+2=, 3 - 6-3=, 10 - 5+5=, 1 - 7-6=, 9 - 8+1=, 7 - 8-1=, 8 - 10-2=,

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