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