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&gt;
&gt;P.S.  Slight look-ahead --
&gt;      Is there an extra right parens in the
&gt;      expression that I pretty-printed below?
&gt;J.A.
&gt;
&gt; &gt; where 'first', 'second', etc., are some fixed set of binary
&gt; &gt; relations.  (In case grammar these correspond to cases such
&gt; &gt; as 'agent', 'subject' and so on, and the 'e' is something like
&gt; &gt; an event or a situation, of type R, correspondi