Provides the generic functions and the S4 methods for the set operations
is.element on sets of associations (e.g., rules, itemsets) and
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sets of associations or itemMatrix objects.
All S4 methods for set operations are defined for the
"ANY" in the signature,
so they should work for all S4 classes for which the following
methods are available:
setdiff return an
object of the same class as
is.element returns a logic vector of length
for each element if it is included in
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