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