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