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