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