def METHOD_NAME(self):
    r"""
    Return distinguished semigroup generators for ``self``.
    OUTPUT: a finite family
    This method should be implemented by all semigroups in
    :class:`FinitelyGeneratedSemigroups`.
    EXAMPLES::
        sage: S = FiniteSemigroups().example()
        sage: S.semigroup_generators()
        Family ('a', 'b', 'c', 'd')
    """