hyper_one
Alright.
It's a statistical fact that "unmatched" number sets (i.e.218) fall about 70% of the time while "doubles" (i.e.226) fall around 25% of time or approximately 1 out of every 4 draws!
However, "doubles" can only fall one of there ways. For example: 22X, 2X2, or X22. This makes them incredible easy to format for a straight win.
I will go further and even state hyper_one, that if you should do a back tracking, whenever a '0' falls in an "unmatched" number set "doubles" usually falls within 7-10 draws later. Again, it may be different in your region but I've noticed that's the pattern here in Ontario.
Again, each region may varies, but I think it something to observer nonetheless.
Good luck and wishing you bountiful winnings!