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