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