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