code: public static String[] getFormatedSirnaSequences(HELM2Notation helm2notation) throws NotationException, RNAUtilsException, HELM2HandledException, org.helm.notation2.exception.NotationException,
        ChemistryException {
      return getFormatedSirnaSequences(helm2notation, DEFAULT_PADDING_CHAR, DEFAULT_BASE_PAIR_CHAR);
    }
docs: generate formated siRNA sequence with default padding char " " and
  base-pair char "|"
  
  @param helm2notation HELM2Notation
  @return string array of formated nucloeotide sequence
  @throws NotationException if notation is not valid
  @throws RNAUtilsException if the polymer is not a RNA/DNA
  @throws HELM2HandledException if it contains HELM2 specific features, so that it can not be casted to HELM1 Format
  @throws org.helm.notation2.exception.NotationException if notation is not valid
  @throws ChemistryException if the Chemistry Engine can not be initialized