I know of one verb u for which it is true that u"u may produce a
different result from u by itself. (u"u means u applied at the rank of
u, and [x] (u -: u"u) y would be a tautology except for this u.)
What is the u? Note that I am interested only in the results of u and
u"u, not any side effects that might result from applying other
operators to u.
Henry Rich
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