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