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