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