Tell me the episode with an 18-49 rating of 2.0/5
CREATE TABLE "weekly" (
  "episode" text,
  "air_date" text,
  "timeslot" text,
  "households_rating_share" text,
  "18_49_rating_share" text,
  "viewers_m" real,
  "weekly_rank_num" text
);
SELECT "episode" FROM "weekly" WHERE "18_49_rating_share"='2.0/5';