MS98-UNIF-HACK : FLAGMS98-UNIF-HACK is a flag or parameter.
If T, do not introduce new constants during unification.
(NOTE: This is a hack; we *do* need to introduce new constants, in
general, but in most cases we needn't bother.)
MS98-UNIF-HACK 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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