mid-wheel overlaps, Hut 8 could compose letter-chains for the middle wheel much in the same way as was illustrated above for the end wheel. That in turn (after Scritchmus) would give at least a partial middle wheel alphabet, and hopefully at least some of the possible choices of rotor for the middle wheel could be eliminated from turnover knowledge (as was done in identifying the end wheel). Taken together, the probable right hand and middle wheels would give a set of bombe runs for the day, that would be significantly reduced from the 336 possible. See also Sequential analysis References Bibliography MacKay, David J. C. Information Theory, Inference, and Learning Algorithms Cambridge: Cambridge University Press, 2003. . This on-line textbook includes a chapter discussing information theory aspects of Banburismus. Further reading Sebag-Montefiore, Hugh. Enigma — the battle for the code. Cassell Military Paperbacks, London, 2004. External links The 1944 Bletchley Park Cryptographic Dictionary "All You Ever Wanted to Know About Banburismus but were Afraid to Ask" — the whole procedure researched in detail, with a worked example. Bletchley Park Alan Turing Banbury Statistical algorithms Cryptographic attacks