> Groff already *does* ignore correct hyphenation points, > namely before the first "\%" (but allows them afterward). > > My concern is that if "\%" only allows specifying > *additional* hyphenation points, then we have no method > of forbidding hyphenation points that the patterns > incorrectly allow.
I'm revising my empirical description of groff's behavior. Groff allows normal hyphenation after the *last* "\%" in the word. Thus, if we end the word with "\&\%", it has the effect of only allowing hyphenation at any of the "\%" given. (If the word contains no "\%" other than the trailing "\&\%", the effect is the same as preceding the word with "\%", i.e., hyphenation is suppressed in this occurrence of the word.) The behavior feels weird, but I'm satisfied that my requirements can be fulfilled using this trick.
