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