15
1 1 1 2
1 1 2 0
1 1 2 1
1 2 0 0
1 2 0 1
1 2 1 0
1 2 1 1
2 0 0 0
2 0 0 1
2 0 1 0
2 0 1 1
2 1 0 0
2 1 0 1
2 1 1 0
2 1 1 1
