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Jim Reeds has come back with the following comment: "Although when used in the 1940s the 5 letter groups of Cypher 5 were not used, I've been looking at them. They all obey a check-sum equation, sum-of-letters = constant, but not all such words are used. Is there a small list of rules for excluding possible groups so that the ones that are left are exactly the ones used?" Reply: I've put up all that seemed relevant, however, Pages vi, vii, viii and 1 are doubly edited. Firstly there is overwriting in dark blue ink and also they have a typewritten insert glued on top of them (detectable by the larger typeface). Nothing like you mention is visible and even after closer examination, nothing else can be discerned.
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