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