human
Solve the following python programming problem given the following code:
def _crosscat_remap_mixed(self, bdb, generator_id, X_L_list, X_D_list, items) : 
    if (items is None) : 
        return (None, X_L_list, self) 
M_c = self._crosscat_metadata (bdb, generator_id) 
    rowids = [item [0] for item in items] 
    (row_ids, X_L_list, X_D_list) = self._crosscat_get_rows (bdb, generator_id, rowids, X_L_list, X_D_list) 
    def remap_tuple(row_id, item) : 
        if (len (item) == 2) : 
            (_, colno) = item 
            return (row_id, crosscat_cc_colno (bdb, generator_id, colno)) 
if (len (item) == 3) : 
            (_, colno, value) = item 
            new_colno = crosscat_cc_colno (bdb, generator_id, colno) 
            new_value = crosscat_value_to_code (bdb, generator_id, M_c, colno, value) 
            return (row_id, new_colno, new_value) 
res = [remap_tuple (row_id, item) for (row_id, item) in zip (row_ids, items)] 
    return (res, X_L_list, X_D_list) 

    
    

    Fix the buggy line: return (None, X_L_list, self)
assistant
#Here is Python program to fix the buggy line: return (None, X_L_list, self)
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return (None, X_L_list, X_D_list)