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