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