15: 13+2=, 14+1=, 10+5=, 12+3=, 20-5=, 30-15=, 35-20=, 20: 10+10=, 14+6=, 17+3=, 15+5=, 16+4=, 12+8=, 30-10=, 25-5=, 40-20=,

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