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