13-6= 12-6= 15-9= 11-4 13-7=
18-9= 15-7= 8+5= 11-5= 6+9=
4+7= 11-6= 13-4= 12-8= 16-9=
4+9-8= 9+9-8= 15-8+7 9+5-6=
11-7+8= 13-6+10= 18-4+3= 16-2-5=
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