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