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