CREATE TABLE table_3517 ("Episode #" CLOB, "Season Episode #" CLOB, "Title" CLOB, "Directed by" CLOB, "Written by" CLOB, "Original air date" CLOB, "Prod. code" CLOB)

What is the number of production codes for episode #73?
SELECT COUNT("Prod. code") FROM table_3517 WHERE "Episode #" = '73'
SELECT COUNT("Prod. code") FROM "table_3517" WHERE "Episode #" = '73'