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