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

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