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