MS98-REWRITE-UNIF is a flag or parameter.
When a rewrite rule can introduce a new variable, this
flag governs the size of the allowed substitutions for that
variable. Essentially, this is a special case of MAX-SUBSTS-VAR.
MS98-REWRITE-UNIF takes values of type NULL-OR-POSINTEGER.
It belongs to subjects MS98-1 .
Its default value is NIL
Its current value is NIL.

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