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