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