def METHOD_NAME(obj):
    """Get multiindex cols from a dask object.
    Parameters
    ----------
    obj : dask DataFrame
    Returns
    -------
    list of pandas index elements
        all column index elements of obj that start with __index__
        i.e., columns that are interpreted as multiindex columns  in the correspondence
    """
    return [x for x in obj.columns if _is_mi_col(x)]