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