0+0
0+0 = 0
0+1
0+1 = 1
0+2
0+2 = 2
0+3
0+3 = 3
0+4
0+4 = 4
0+5
0+5 = 5
0+6
0+6 = 6
0+7
0+7 = 7
0+8
0+8 = 8
0+9
0+9 = 9
0-0
0-0 = 0
1+0
1+0 = 1
1+1
1+1 = 2
1+2
1+2 = 3
3+2
3+2 = 5
1+3
1+3 = 4
1+4
1+4 = 5
1+5
1+5 = 6
1+6
1+6 = 7
1+7
1+7 = 8
1+8
1+8 = 9
1+9
1+9 = 10
1-1
1-1 = 0
2+0
2+0 = 2
2+1
2+1 = 3
2+2
2+2 = 4
2+3
2+3 = 5
2+4
2+4 = 6
2+5
2+5 = 7
2+6
2+6 = 8
2+7
2+7 = 9
2+8
2+8 = 10
2+9
2+9 = 11
2+1
2+1 = 31
2-0
2-0 = 2
2-1
2-1 = 1
2-2
2-2 = 0
3+1
3+1 = 4
3+2
3+2 = 5
3+3
3+3 = 6
3+4
3+4 = 7
3+5
3+5 = 8
3+6
3+6 = 9
3+8
3+8 = 11
3+9
3+9 = 12
3-1
3-1 = 2
3-2
3-2 = 1
5-2
5-2 = 3
3-3
3-3 = 0
4+1
4+1 = 5
4+2
4+2 = 6
4+3
4+3 = 7
4+4
4+4 = 8
4+5
4+5 = 9
4+6
4+6 = 10
4+7
4+7 = 11
4+8
4+8 = 12
4+9
4+9 = 13
4-1
4-1 = 3
4-2
4-2 = 2
4-3
4-3 = 1
4-4
4-4 = 0
5+1
5+1 = 6
5+2
5+2 = 7
5+3
5+3 = 8
5+4
5+4 = 9
5+5
5+5 = 10
5+6
5+6 = 11
5+7
5+7 = 12
5+8
5+8 = 13
5+9
5+9 = 14
5-1
5-1 = 4
5-2
5-2 = 3
5-3
5-3 = 2
5-4
5-4 = 1
5-5
5-5 = 0
6+1
6+1 = 7
6+2
6+2 = 8
6+4
6+4 = 10
6+5
6+5 = 11
6+6
6+6 = 12
6+8
6+8 = 14
6+9
6+9 = 15
6-1
6-1 = 5
6-2
6-2 = 4
6-3
6-3 = 3
6-4
6-4 = 2
6-5
6-5 = 1
6-6
6-6 = 0
7+1
7+1 = 8
7+2
7+2 = 9
6+3
6+3 = 91
7+5
7+5 = 12
7+7
7+7 = 14
7+8
7+8 = 15
7+9
7+9 = 16
7-1
7-1 = 6
7-2
7-2 = 5
7-3
7-3 = 4
7-4
7-4 = 3
7-5
7-5 = 2
7-6
7-6 = 1
7-7
7-7 = 0
8+1
8+1 = 9
8+2
8+2 = 10
8+3
8+3 = 11
8+4
8+4 = 12
8+5
8+5 = 13
8+6
8+6 = 14
8+7
8+7 = 15
8+8
8+8 = 16
8+9
8+9 = 17
8-1
8-1 = 7
8-2
8-2 = 6
8-3
8-3 = 5
8-4
8-4 = 4
8-5
8-5 = 3
8-6
8-6 = 2
8-7
8-7 = 1
8-8
8-8 = 0
9+1
9+1 = 10
9+2
9+2 = 11
9+3
9+3 = 12
9+4
9+4 = 13
9+5
9+5 = 14
9+6
9+6 = 15
9+7
9+7 = 16
9+8
9+8 = 17
9+9
9+9 = 18
9-1
9-1 = 8
9-2
9-2 = 7
9-3
9-3 = 6
9-4
9-4 = 5
9-5
9-5 = 4
9-6
9-6 = 5
9-7
9-7 = 2
9-8
9-8 = 1
9-9
9-9 = 0
10-1
10-1 = 9
10-2
10-2 = 8
10-4
10-4 = 6
10-5
10-5 = 5
10-6
10-6 = 4
10-8
10-8 = 2
10-9
10-9 = 1
11-2
11-2 = 9
11-3
11-3 = 8
11-4
11-4 = 7
11-5
11-5 = 6
11-6
11-6 = 5
11-7
11-7 = 4
11-8
11-8 = 3
11-9
11-9 = 2
12-3
12-3 = 9
12-4
12-4 = 8
12-5
12-5 = 7
12-6
12-6 = 6
12-7
12-7 = 5
12-8
12-8 = 4
12-9
12-9 = 3
13-4
13-4 = 9
13-5
13-5 = 8
13-8
13-8 = 5
13-9
13-9 = 4
14-5
14-5 = 9
14-6
14-6 = 8
14-7
14-7 = 7
14-8
14-8 = 6
14-9
14-9 = 5
15-6
15-6 = 9
15-7
15-7 = 8
15-8
15-8 = 7
15-9
15-9 = 6
16-7
16-7 = 9
16-8
16-8 = 8
16-9
16-9 = 7
17-8
17-8 = 9
17-9
17-9 = 8
18-9
18-9 = 9