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