MS98-DUP-PRIMSUBS is a flag or parameter.
When T, MS98-DUP duplicates variables which have primsubs;
when NIL, it doesn't. (Note that duplicating the variable will
not duplicate the primsub; it will produce another copy of the
unsubstituted-for tree below that expansion node.)
MS98-DUP-PRIMSUBS takes values of type BOOLEAN.
It belongs to subjects MS98-MINOR .
Its default value is NIL
Its current value is NIL.

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