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