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