What is the other premiership when the runner up wis Geelong?
CREATE TABLE "double_premiership_teams" (
  "season" real,
  "premier" text,
  "runner_up" text,
  "score" text,
  "venue" text,
  "attendance" real,
  "premiership" text
);
SELECT "premiership" FROM "double_premiership_teams" WHERE "runner_up"='Geelong';