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