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