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