0-0
0-0 = 0
1-1
1-1 = 0
2-0
2-0 = 2
2-1
2-1 = 1
2-2
2-2 = 0
3-1
3-1 = 2
3-2
3-2 = 1
5-2
5-2 = 3
3-3
3-3 = 0
4-1
4-1 = 3
4-2
4-2 = 2
4-3
4-3 = 1
4-4
4-4 = 0
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 = 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 = 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 = 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 = 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