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