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