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