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