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