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