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