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