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