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