def _auto_correlations(n_states):
    """Returns list of autocorrelations

    Args:
        n_states: number of local states

    Returns:
        list of tuples for autocorrelations

    >>> l = _auto_correlations(np.arange(3))
    >>> assert l == ((0, 1, 2), (0, 1, 2))
    """
    return tuple(n_states), tuple(n_states)
