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