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