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