Removes all of my elements that are contained in the specified collection (optional operation). The behavior of this method is unspecified if the given collection is modified while this method is executing. Note that this includes the case in which the given collection is this collection, and it is not empty.
@param c the collection of elements to remove
@return true iff I contained the at least one of thespecified elements, in other words, returns true iff I changed as a result of this call
@throws UnsupportedOperationException when this operation is not supported
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