public TreeSet(SortedSet<E> set) {this(set.comparator());Iterator<E> it = set.iterator();while (it.hasNext()) {add(it.next());}}

public TreeSet(java.util.SortedSet<E> set) : this(set.comparator()){java.util.Iterator<E> it = set.iterator();while (it.hasNext()){add(it.next());}}
