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