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