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