CREATE TABLE table_21739 ("Series #" FLOAT, "Episode #" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "U.S. viewers  ( million ) " TEXT, "Original airdate" TEXT, "Production Code" TEXT)

Who were the writers for production code 2t6268?
SELECT "Written by" FROM table_21739 WHERE "Production Code" = '2T6268'
SELECT "Written by" FROM "table_21739" WHERE "Production Code" = '2T6268'