def _make_multiple_arg(self, arg_name, arg_list):
    """Jacoco cli allows the specification of multiple values for certain args by repeating the
    argument with a new value. E.g. --classfiles a.class --classfiles b.class, etc. This method
    creates a list of strings interleaved with the arg name to satisfy that format.
    """
    unique_args = list(set(arg_list))

    args = [(arg_name, f) for f in unique_args]
    flattened = list(sum(args, ()))

    return flattened