CREATE TABLE table_22225 ("No. in series" FLOAT, "No. in season" FLOAT, "Title" CLOB, "Directed by" CLOB, "Written by" CLOB, "Original air date" CLOB, "Production code" CLOB, "U.S. viewers  ( millions ) " CLOB)

Who were the authors of episode having production code 3t7573?
SELECT "Written by" FROM table_22225 WHERE "Production code" = '3T7573'
SELECT "Written by" FROM "table_22225" WHERE "Production code" = '3T7573'