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