Thanks for the links.  Toc191734495 describes much of what I've seen.  It
also explains how modifiers which ignore x and y arguments preceeded
current derived verbs.  However, based on my tests, the information there
is not sufficient to avoid the value error I initially reported.

1)  It isn't just the presence of x or y which creates derived verbs.
     Derived adverbs must contain
          (u OR m) AND (x OR y).
     For derived conjunctions, I assume the first list is
          (u OR m OR v OR n),
     but I haven't done a complete analysis.
2)  The presence of x only counts in the dyadic form.  If a
     reference of x is present in the monadic form, it is
     one of the following.
     If this modifier is immediate, another copy of u
     for historical reasons.
     If this is a derived modifier, a reference to the global x.
3)  The immediate versions of Adverbs only use the
     monadic definition, and
     immediate Conjunctions prefer the dyadic definition.

Paul
On Apr 11, 2012 4:36 AM, "Henry Rich" <henryhr...@nc.rr.com> wrote:
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