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