CREATE TABLE table_29793 ("No. in series" FLOAT, "No. in season" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Production code ( s ) " FLOAT, "U.S. viewers  ( millions ) " TEXT)

who are the writers of the episode whose production code(s) is 225560?
SELECT "Written by" FROM table_29793 WHERE "Production code(s)" = '225560'
SELECT "Written by" FROM "table_29793" WHERE "Production code(s)" = '225560'