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