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