CREATE TABLE table_19393 ("No. in series" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Production code" FLOAT)

What was the production code of the episode that was written by michael dante dimartino and directed by lauren macmullan?
SELECT "Production code" FROM table_19393 WHERE "Written by" = 'Michael Dante DiMartino' AND "Directed by" = 'Lauren MacMullan'
SELECT "Production code" FROM "table_19393" WHERE "Directed by" = 'Lauren MacMullan' AND "Written by" = 'Michael Dante DiMartino'