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