@NotNull
      @Override
      public Iterator<String> getIn(String n) {
        final Collection<String> siblings = new LinkedHashSet<>();

        for (PropertiesOrder order : propertiesOrders) {
          for (String nextKey : order.getNext(n)) {
            if (isAlphaSorted[0] && String.CASE_INSENSITIVE_ORDER.compare(n, nextKey) > 0) {
              isAlphaSorted[0] = false;
            }
            siblings.add(nextKey);
          }
        }

        return siblings.iterator();
      }
@NotNull
      @Override
      public Iterator<String> getIn(String n)