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