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