}
        };
    final ImmutableRangeMap<K, V> outer = this;
    return new ImmutableRangeMap<K, V>(subRanges, values.subList(lowerIndex, upperIndex)) {
      @Override
      public ImmutableRangeMap<K, V> subRangeMap(Range<K> subRange) {
        if (range.isConnected(subRange)) {
          return outer.subRangeMap(subRange.intersection(range));
        } else {