CREATE TABLE table_73324 ("No." FLOAT, "#" FLOAT, "Title" CLOB, "Directed by" CLOB, "Written by" CLOB, "U.S. viewers  ( million ) " CLOB, "Original air date" CLOB, "Production code" FLOAT)

Who wrote the episode with the production code 519?
SELECT "Written by" FROM table_73324 WHERE "Production code" = '519'
SELECT "Written by" FROM "table_73324" WHERE "Production code" = '519'