15-2=
16-8=
2+5=
13-3=
17-1=
14-2=
1-1=
18-1=
5-1=
7-6=
11-9=
19-18=
18-18=
5+12=
2-1=
12+4=
16-13=
11-10=
8+0=
12-2=
17-3=
14-9=
0+4=
15+3=
8-2=
12-1=
15-4=
19-17=
5-1=
17+3=
0+7=
12+1=
18-3=
7+2=
14-4=
2+4=
17+3=
4+3=
0+3=
15-15=
8-7=
10+0=
9-1=
12-4=
11-11=
9-8=
9-6=
0+1=
2+18=
5-5=
13-11=
12-0=
4+13=
8+10=
6+4=
17+3=
1+7=
9+2=
18-11=
9+3=
4+15=
0+9=
5+11=
20-19=
2+16=
10+2=
2+15=
19-8=
0+11=
10+3=
3-2=
19-16=
3-1=
0+11=
4-0=
1+15=
17-1=
9-8=
4+11=
18+2=
4-1=
2+7=
9-7=
16+2=
12+8=
20-10=
6+11=
0+8=
8-3=
5+3=
9+6=
1+5=
4+8=
0+17=
11-1=
4+1=
17-11=
17-12=
17-15=
18-9=
