Nice series. Looking at the frequency analysis reminds me of the old-school Wheel Of Fortune bonus round where contestants could pick 5 consonants and 1 vowel. And they almost always picked R-S-T-L-N-E. So maybe a game show strategy question would be whether L is really a better guess than H (in the sense of being more helpful to solving the puzzle), even though H occurs more often than L. There are some great articles about using analysis to beat game shows, particularly stories about the guy who beat the "press-your-luck" non-random generator: http://en.wikipedia.org/wiki/Michael_Larson.