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