return other;
    } else {
      C lowerEndpoint = Ordering.<C>natural().max(this.first(), other.first());
      C upperEndpoint = Ordering.<C>natural().min(this.last(), other.last());
      return (lowerEndpoint.compareTo(upperEndpoint) <= 0)
          ? ContiguousSet.create(Range.closed(lowerEndpoint, upperEndpoint), domain)
          : new EmptyContiguousSet<C>(domain);
    }
  }

  @Override
  public Range<C> range() {