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