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