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