code: public final static void deleteMonomerNotation(int position, PolymerNotation polymer) throws NotationException {
  		MonomerNotation monomerNotation = polymer.getPolymerElements().getListOfElements().get(position);
  		if (polymer.getPolymerElements().getListOfElements().size() == 1) {
  			throw new NotationException(monomerNotation.toString()
  					+ " can't be removed. Polymer has to have at least one Monomer Notation");
  		}
  		polymer.getPolymerElements().getListOfElements().remove(monomerNotation);
  	}
docs: method to delete a MonomerNotation at a specific position of the
  PolymerNotation
  
  @param position
  position of the to be deleted MonomerNotation
  @param polymer
  PolymerNotation
  @throws NotationException
  if the generated PolymerNotation has no elements after
  deleting the MonomerNotation