What is the group name when 3yo hcp restricted maiden was raced?
CREATE TABLE "2004_05_season_as_a_three_year_old" (
  "result" text,
  "date" text,
  "race" text,
  "venue" text,
  "group" text,
  "distance" text,
  "weight_kg" text,
  "jockey" text,
  "winner_2nd" text
);
SELECT "group" FROM "2004_05_season_as_a_three_year_old" WHERE "race"='3yo Hcp Restricted Maiden';