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