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