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