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