return a.intersection(b).union(a.complement().intersection(b.complement())).abs()
return a.intersection(b).intersection(a.complement().intersection(b.complement())).abs()
	public double getSimilarity() {		FuzzySet a = getQuery();		FuzzySet b = getTarget();		return a.intersection(b).union(a.complement().intersection(b.complement())).abs() 			/ a.union(b).intersection(a.complement().union(b.complement())).abs();	}