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