5-2= 6+3= 8+2= 9-2=
10+7= 7-1= 6-0= 10-2=
15-8= 11-5= 14-7= 16-6=
11+6= 16-9= 11-7= 10+8=
15-7= 11-9= 14-6= 15-9=
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