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