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