code: public String generateHELMFromFastaNucleotide(String notation)
  			throws FastaFormatException, org.helm.notation2.parser.exceptionparser.NotationException,
  			ChemistryException, MonomerLoadingException, NucleotideLoadingException {
  		String result = FastaFormat.generateRNAPolymersFromFastaFormatHELM1(notation).toHELM2();
  		setMonomerFactoryToDefault(notation);
  		return result;
  	}
docs: method to generate HELM from a FASTA containing rna/dna sequences
  
  @param notation
  FASTA containing rna/dna sequences
  @return HELM
  @throws FastaFormatException
  if the input is not valid
  @throws org.helm.notation2.parser.exceptionparser.NotationException
  if notation is not valid
  @throws ChemistryException
  if chemistry engine can not be initialized
  @throws MonomerLoadingException
  if monomers can not be loaded
  @throws NucleotideLoadingException
  if nucleotides can not be loaded