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