@staticmethod
def setup_command_line(parser):
    """Setup the command line options for Counting Principle formula

        Arguments:
        - `parser`: parser to load with options.
        """
    parser.add_argument('M', metavar='<M>', type=int, help='domain size')
    parser.add_argument('p', metavar='<p>', type=int, help='size of the parts')
