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