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