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