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