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