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