MTREE-FILTER-DUPS is a flag or parameter.
If T, will not add the same link to a mating twice on
the same branch of a matingstree during automatic search. If NIL,
will add it as many times as it wants to.
MTREE-FILTER-DUPS takes values of type BOOLEAN.
It belongs to subjects ETREES MTREE-TOP .
Its default value is T
Its current value is T.

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