input:

15 40
8 2 4 9 1 1 5 10 4 9 4 4 9 1 4
3 10 2 2 3 10 5 5 4 5 5 4 1 9 5
9 4 9 9
10 11 2 11
13 1 4 1
10 1 10 1
4 13 12 13
3 8 6 11
6 1 3 1
13 11 13 12
4 3 4 11
10 13 10 3
2 14 15 14
15 5 12 2
2 11 9 11
4 8 11 8
6 6 9 6
12 10 3 1
6 7 11 7
4 3 4 2
12 6 1 6
12 6 8 6
9 11 9 11
10 8 7 5
5 2 5 12
13 8 10 5
1 ...

output:

result:

FAIL Condition failed: "x1 != x2 || y1 != y2"