9-2= 8-6= 8-4= 7-5= 5+5=
4+3= 2-0= 6-0= 3+2= 10-9=
4+4= 10-1= 8+2= 6-3= 3+5-6=
2+2= 10-5= 10-8= 2+4= 5+2+2=