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