code: public Set<T> newColl(Collection<T> coll) {
  	Set<T> newSet = this.create();
  	newSet.addAll(coll);
  	return newSet;
      }
docs: Default implementation: uses <code>create()</code> to create
  an empty set, and next adds all elements from
  <code>coll</code> to the newly-created set.
  
  @see Factory#create(Object)