CREATE TABLE table_31323 ("Series #" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Production code" TEXT, "U.S. viewers  ( million ) " TEXT)

Who is the writer when the director is bob berlinger?
SELECT "Written by" FROM table_31323 WHERE "Directed by" = 'Bob Berlinger'
SELECT "Written by" FROM "table_31323" WHERE "Directed by" = 'Bob Berlinger'