16-1+2= 17-2+4= 8+9-7= 17-9+2=12+3-7= 14+6-2= 10+4-8= 10-7+1=
17-2= 17-4= 18-6= 12-1= 7-5= 12-2=
9-3= 9-5= 18-2= 11-1= 9-6= 9-1=
19-4= 19-6= 16-5= 16-4= 16-0= 16-2=
7+2= 2+5= 12+5= 11+1= 7+3= 12+1=
5+2= 5+4= 15+1= 11+5= 5+5= 12+3=