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