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