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