14 3
0 0 1 4
0 0 2 2
0 0 3 1
0 0 3 4
0 1 5 3
0 1 5 4
0 1 6 1
0 1 7 2
0 1 8 1
0 1 8 2
0 1 9 3
0 2 5 1
0 2 5 4
0 2 6 2
0 2 6 3
0 2 7 2
0 2 9 1
0 2 9 3
0 3 5 1
0 3 5 3
0 3 5 4
0 3 8 2
0 3 9 2
0 4 5 3
0 4 6 4
0 4 7 1
0 4 7 2
0 4 8 1
0 4 8 3
0 4 9 4
5 6 5 7
5 6 7 9
5 7 5 8
5 7 5 9
5 8 6 7
6 6 6 7
6 6 9 9
6 7 6 8
6 8 8 7
6 8 8 9
7 8 7 9
8 9 9 9