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