def METHOD_NAME(self):
    r"""
    Return an element of the CW complex, as per
    :meth:`Sets.ParentMethods.an_element`.
    EXAMPLES::
        sage: from sage.categories.cw_complexes import CWComplexes
        sage: X = CWComplexes().example()
        sage: X.an_element()
        2-cell f
    """
    return self.element_class(self, 2, 'f')