 
 /// Returns a new set with all elements from `set` which are not contained in `other`.
 public func - <Element> (set: Set<Element>, other: Set<Element>) -> Set<Element> {
-	return set.difference(other)
+	return set.complement(other)
 }
 
 /// Removes all elements in `other` from `set`.
 public func -= <Element> (inout set: Set<Element>, other: Set<Element>) {
-	set = set.difference(other)
+	set = set.complement(other)
 }
 
 

		:	set.filter { self.contains($0) }
	}

	/// Returns a new set with all elements from the receiver which are not contained in `set`.
	public func difference(set: Set) -> Set {
		return filter { !set.contains($0) }
	}



	/// True iff the receiver is a subset of (is included in) `set`.
	public func subset(set: Set) -> Bool {
		return complement(set) == Set()
	}

	/// True iff the receiver is a subset of but not equal to `set`.
