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