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