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