CREATE TABLE table_23767 ("No. in series" FLOAT, "No. in season" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Production code" TEXT)

How many different production codes does the episode directed by Dominic Polcino have?
SELECT COUNT("Production code") FROM table_23767 WHERE "Directed by" = 'Dominic Polcino'
SELECT COUNT("Production code") FROM "table_23767" WHERE "Directed by" = 'Dominic Polcino'