9+4= 12-8= 6+9= 11-4= 7+7=
12-4= 14-9= 18-9= 13-7= 15-7=
13-9= 12-3= 11-2= 4+9= 16-9=
9+3= 11-7= 12-6= 16-8= 14-8=
5+6= 17-7= 9+9= 12-10= 4 + 9 =