def METHOD_NAME(self):
    """
    Return a string representation of ``self``.
    TESTS::
        sage: crystals.Tableaux(['A', [1, 2]], shape=[2,1])
        Crystal of BKK tableaux of shape [2, 1] of gl(2|3)
    """
    m = self._cartan_type.m + 1
    n = self._cartan_type.n + 1
    return "Crystal of BKK tableaux of shape {} of gl({}|{})".format(self.shape(), m, n)