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