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