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