code: public static HELM2Notation getSiRNANotation(String senseSeq, String antiSenseSeq)
  			throws NotationException, FastaFormatException, HELM2HandledException, RNAUtilsException,
  			org.helm.notation2.exception.NotationException, ChemistryException, CTKException,
  			NucleotideLoadingException {
  		return getSirnaNotation(senseSeq, antiSenseSeq, NucleotideParser.RNA_DESIGN_NONE);
  	}
docs: this method converts nucleotide sequences into HELM2Notation
  
  @param senseSeq
  5-3 nucleotide sequence for default notation
  @param antiSenseSeq
  3-5 nucleotide sequence for default notation
  @return HELM2Notation for siRNA
  @throws NotationException
  if notation is not valid
  @throws FastaFormatException if the fasta input is not valid
  @throws HELM2HandledException if it contains HELM2 specific features, so that it can not be casted to HELM1 Format
  @throws RNAUtilsException if the polymer is not a RNA/DNA
  @throws org.helm.notation2.exception.NotationException if notation is not valid
  @throws ChemistryException
  if the Chemistry Engine can not be initialized
  @throws CTKException general ChemToolKit exception passed to HELMToolKit
  @throws NucleotideLoadingException if nucleotides can not be loaded