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