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