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