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