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