...the three most common consonants are R,T and L (and they're all more frequent than I or U) so you should be testing for them in the first couple of lines. In fact, today had four letters from the 6 most common letters, so you should be getting all of those very early on, as yellows at least. And Y is another useful letter that's only slightly less common than U but is almost always in last position, that high chance of a green makes it particularly informative. Today was one of the exceptions, obvs!