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