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