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