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