How many races is different distances does Rosehill Guineas compete in? 
CREATE TABLE "1995_96_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 COUNT("distance") FROM "1995_96_season_as_a_three_year_old" WHERE "race"='Rosehill Guineas';