def METHOD_NAME(cls, identifier, name):
    if identifier == 'E':
        # Juvenile fiction
        return cls.AUDIENCE_CHILDREN
    if isinstance(identifier, (bytes, str)) and identifier.startswith('J'):
        return cls.AUDIENCE_CHILDREN
    if isinstance(identifier, (bytes, str)) and identifier.startswith('Y'):
        return cls.AUDIENCE_YOUNG_ADULT
    if isinstance(identifier, (bytes, str)) and identifier=='FIC':
        # FIC is used for all types of fiction.
        return None
    # Everything else is _supposedly_ for adults, but we don't
    # trust that assumption.
    return None