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