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