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