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