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