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