CREATE TABLE table_27637 ("Series #" FLOAT, "Title" CLOB, "Director" CLOB, "Writer" CLOB, "Air Date" CLOB, "Production Code" FLOAT)

What was the production code of the episode written by Brendan Cowell?
SELECT "Production Code" FROM table_27637 WHERE "Writer" = 'Brendan Cowell'
SELECT "Production Code" FROM "table_27637" WHERE "Writer" = 'Brendan Cowell'