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