}

    private NavigableMap<Cut<C>, Range<C>> subMap(Range<Cut<C>> subWindow) {
      if (!complementLowerBoundWindow.isConnected(subWindow)) {
        return ImmutableSortedMap.of();
      } else {
        subWindow = subWindow.intersection(complementLowerBoundWindow);
        return new ComplementRangesByLowerBound<>(positiveRangesByLowerBound, subWindow);
      }
    }

    @Override