def METHOD_NAME(self):
    r"""
    Returns the one of the monoid, as per :meth:`Monoids.ParentMethods.one`.
    EXAMPLES::
        sage: M = Monoids().example(); M
        An example of a monoid: the free monoid generated by ('a', 'b', 'c', 'd')
        sage: M.one()
        ''
    """
    return self("")