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