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