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