human
Solve the following python programming problem given the following code:
def count_e2e_one_time_keys(self, user_id, device_id) : 
    ' Count the number of one time keys the server has for a device
        Returns:
            Dict mapping from algorithm to number of keys for that algorithm.
        ' 
    def _count_e2e_one_time_keys(txn) : 
        sql = 'SELECT algorithm, COUNT(key_id) FROM e2e_one_time_keys_json WHERE user_id = ? AND device_id = ? GROUP BY algorithm' 
        txn.execute (sql, (user_id, device_id)) 
        result = { 
            
} 
        for (algorithm, key_count) in txn.fetchall () : 
            result [algorithm] = key_count 
return result 
return self.runInteraction ('count_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 _count_e2e_one_time_keys(