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