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