public <R extends Set<T>> R differenceInto(SetIterable<? extends T> subtrahendSet, R targetSet) { return SetIterables.differenceInto(this, subtrahendSet, targetSet); }
public ImmutableSortedSet<T> difference(SetIterable<? extends T> subtrahendSet) { return SetIterables.differenceInto( this, subtrahendSet, TreeSortedSet.<T>newSet(this.comparator())) .toImmutable(); }