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