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