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