[verroq]

How do you know that blurring one character produces the same effect as blurring two characters close together?

[jrockway]

You don't need to know this. You make an image of the text for every combination possible, apply the blur algorithm, and see which one is a pixel-perfect match for to the image on the web site.

Or rather, you don't do this, you write a program to do it :)

[verroq]

But you'll have to go through 64 ^ (64 x 9), combinations which will take years which was what I said in the first post.