 20 17 7
0 0 1 0 0 0 0 0 0 0 1 1 0 1 0 1 0 0 1 1
 9 17 20
 1 18 19
 5 14 15
 6 8 14
 13 15 19
 1 6 19
 9 13 14
 6 18 19
 8 9 11
 7 8 16
 2 13 14
 2 10 12
 1 7 14
 1 3 17
 4 12 13
 1 2 12
 8 13 20
