How many clubs were remaining in the preliminary round?
CREATE TABLE "teams" (
  "round" text,
  "clubs_remaining" real,
  "clubs_involved" real,
  "winners_from_previous_round" text,
  "new_entries_this_round" text,
  "leagues_entering_at_this_round" text
);
SELECT "clubs_remaining" FROM "teams" WHERE "round"='Preliminary round';