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