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