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