Table schema:
CREATE TABLE table_14562722_1 (production_code VARCHAR, written_by VARCHAR, directed_by VARCHAR)

Question: What was the production code of the episode that was written by michael dante dimartino and directed by lauren macmullan?
SQL: SELECT production_code FROM table_14562722_1 WHERE written_by = "Michael Dante DiMartino" AND directed_by = "Lauren MacMullan"