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