CREATE TABLE table_25771 ("No. in series" FLOAT, "No. in season" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Production code" TEXT, "U.S. viewers  ( millions ) " TEXT)

What's the production code of the episode seen by 7.49 million people in the US?
SELECT "Production code" FROM table_25771 WHERE "U.S. viewers (millions)" = '7.49'
SELECT "Production code" FROM "table_25771" WHERE "U.S. viewers (millions)" = '7.49'