1. If you get WA1 - check if you considered that the domino is mirrored.
2. Some tests (e.g. training samples), which is grouped by the number of points:

0

1
2 2

2
2 2
6 2
2
1 1
3 3

3
1 1
3 3
6 2
3
1 1
2 2
3 3

4
5 1
5 3
7 1
7 3
4
1 1
2 2
3 3
6 2
4
1 1
3 3
5 1
7 3

5
5 1
5 3
6 2
7 1
7 3
5
6 2
1 1
1 3
3 1
3 3
5
1 1
2 2
3 3
5 1
7 3

6
5 1
5 3
6 1
6 3
7 1
7 3
6
6 2
1 1
1 3
3 1
3 3
2 2
6
1 1
1 3
3 1
3 3
5 1
7 3
6
1 1
2 2
3 3
5 1
6 2
7 3

7
6 2
1 1
2 1
3 1
1 3
2 3
3 3
7
1 1
2 2
1 3
3 1
3 3
5 1
7 3
7
5 1
6 2
7 3
1 1
1 3
3 1
3 3

8
1 1
2 1
3 1
1 3
2 3
3 3
5 1
7 3
8
1 1
1 3
2 2
3 1
3 3
5 1
6 2
7 3
8
1 1
1 3
3 1
3 3
5 1
5 3
7 1
7 3

9
1 1
2 2
1 3
3 1
3 3
5 1
5 3
7 1
7 3
9
5 3
6 2
7 1
1 1
2 1
3 1
1 3
2 3
3 3

10
1 1
1 3
2 2
3 1
3 3
5 1
5 3
6 2
7 1
7 3
10
1 1
1 3
2 1
2 3
3 1
3 3
5 1
5 3
7 1
7 3

11
5 1
5 3
6 2
7 1
7 3
1 1
1 3
2 1
2 3
3 1
3 3

12
1 1
2 1
3 1
1 3
2 3
3 3
5 1
5 3
6 1
6 3
7 1
7 3