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