For what episode was the nominee (s) Walon Green, Joe Sachs nominated as a result?
CREATE TABLE "wga_awards" (
  "year" real,
  "category" text,
  "nominee_s" text,
  "episode" text,
  "result" text
);
SELECT "episode" FROM "wga_awards" WHERE "result"='nominated' AND "nominee_s"='walon green, joe sachs';