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