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