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