Finding some weird features (rules)

[frekvent]

I find another possible weirdness. I'm trying to understand why the rules "x24" and "x42" are different. "x24" gives me 569 hits and "x42" gives me 336 hits when I run them against the phpbb hashes. I understand that the rules won't work with words shorter than four characters. Are the indices different when you delete from 4 to 2 compared to when you delete from 2 to 4?