What are the best filters for the 31/7 lottery? *

[jack]

What are the best filters for the 31/7 lottery?
* We have 31 numbers and are drawn 7 in each draw?
03 05 08 09 19 21 30
08 11 12 14 20 21 28
11 12 21 24 25 28 29
06 07 13 15 18 19 29
02 08 09 17 19 24 28
01 11 18 19 26 30 31
02 05 06 14 20 24 25
01 04 13 21 22 24 27
03 10 13 18 19 23 24
06 10 13 18 19 20 30
07 13 16 19 20 27 31
02 03 07 12 17 21 22