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