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