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