20-3= 2+8= 19-16= 12+8= 20-9= 17-10=
15-8= 14+3= 11+7= 11-9=
1+16= 19-16= 5+8= 6+7= 13-7=
9+1= 19-4= 20-19= 15-5= 4+11= 9+10=
10-2= 18-17= 6+14=
18-8= 9+6= 8-6=
7-5= 13+2= 19-12=
11+9= 17-12= 16-4=
13-1= 16-8= 14+3= 3+4= 19-17= 5-1= 15+5= 20-1= 19-10= 7-1= 6-3= 6+13= 11-3= 11+7= 10+4= 20-15= 17-7= 5+13= 1+8= 9+7= 13-2= 9-1= 17-9= 6-1= 18-4= 14-13= 10-1= 15-2= 12-2= 3+5= 9+5= 13-1= 16-5= 12-1= 4+5= 13+4= 5-2= 7-2= 5+3= 4+12= 15+5= 12+1= 3+7= 14-6= 7+8= 3+6= 16-6= 1+18=
19-18=
7+13= 1+7=
13+2=
17-8= 17-7=
2+5=
3-2= 7+10=
16-10=
5+6= 11-10=
18-16=
14-2=