20 3
0 0 1 1
0 0 1 3
0 0 3 4
0 0 6 6
0 1 7 1
0 1 7 3
0 1 7 5
0 1 9 5
0 1 10 3
0 2 7 1
0 2 8 1
0 2 9 5
0 2 10 3
0 2 11 1
0 2 11 2
0 2 11 4
0 3 7 4
0 3 8 2
0 3 8 5
0 3 9 2
0 3 9 6
0 3 11 2
0 4 7 1
0 4 8 6
0 4 9 2
0 4 10 1
0 4 10 4
0 4 11 2
0 4 11 3
0 5 7 4
0 5 7 6
0 5 8 2
0 5 8 3
0 5 9 5
0 5 10 6
0 5 11 6
0 6 8 4
0 6 9 5
0 6 9 6
0 6 10 5
0 6 11 3
0 6 11 4
7 7 11 10
7 8 7 10
7 8 9 11
7 8 11 8
7 9 8 10
7 9 9 8
7 9 10 10
7 10 7 11
7 10 9 9
7 11 8 9
7 11 9 8
8 8 8 10
8 8 9 9
8 8 11 10
9 10 10 10
9 10 11 10
9 10 11 11
10 11 11 11