def METHOD_NAME(self):
    """
    Return the facets of ``self``.
    EXAMPLES::
        sage: from sage.categories.graphs import Graphs
        sage: C = Graphs().example()
        sage: C.facets()
        [(0, 1), (1, 2), (2, 3), (3, 4), (4, 0)]
    """
    return self.edges()