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