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