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