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