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