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