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