3+2=5, 4+3=7, 6+5=11, 8+5=13, 11+4=15, 9+7=16, 7+4=11, 12+2=14, 12+6=18, 13+4=17, 17+6=23, 9+9=18, 8+7=15, 13+3=16, 18+7=25

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