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