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