code: public static <S extends Sequence<C>, C extends Compound> String getIDFormat(List<S> sequences) {
  		int length = 0;
  		for (S as : sequences) {
  			length = Math.max(length, (as.getAccession() == null) ? 0 : as.getAccession().toString().length());
  		}
  		return (length == 0) ? null : "%-" + (length + 1) + "s";
  	}
docs: Creates format String for accession IDs
  
  @param sequences list of sequences
  @return format String for accession IDs