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