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