code: private String createSpan(final List<String> lemmas, final int from,
        final int to) {
      String lemmaSpan = "";
      for (int i = from; i < to; i++) {
        lemmaSpan += lemmas.get(i) + "_";
      }
      lemmaSpan += lemmas.get(to);
      return lemmaSpan;
    }
docs: Create lemma span for search of multiwords in MFS dictionary.
  
  @param lemmas
  the lemmas of the sentence
  @param from
  the starting index
  @param to
  the end index
  @return the string representing a perhaps multi word entry