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