Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_21550870_1 (production_code VARCHAR, written_by VARCHAR)
### Question:
Name the total number of production code for  episode by steve cohen & andrew dettman
### Answer:
SELECT COUNT(production_code) FROM table_21550870_1 WHERE written_by = "Steve Cohen & Andrew Dettman"