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