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