human
Solve the following python programming problem given the following code:
def add_e2e_one_time_keys(self, user_id, device_id, time_now, key_list) : 
    def _add_e2e_one_time_keys(txn) : 
        for (algorithm, key_id, json_bytes) in key_list : 
            self._simple_upsert_txn (txn, table = 'e2e_one_time_keys_json', keyvalues = { 
                'user_id' : user_id, 
                'device_id' : device_id, 
                'algorithm' : algorithm, 
                'key_id' : key_id, 
}, values = { 
                'ts_added_ms' : time_now, 
                'key_json' : json_bytes, 
}) 
return self.runInteraction ('add_e2e_one_time_keys', <MASK>) 
    
    Given the code above, what is a proper replacement for <MASK>?
assistant
#Here is a proper replacement for <MASK>.
def _add_e2e_one_time_keys(