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