List the number of locations for the team known as the billikens.
CREATE TABLE "members" (
  "institution" text,
  "nickname" text,
  "location" text,
  "founded" real,
  "type" text,
  "enrollment" real,
  "joined" real,
  "left" real
);
SELECT COUNT("location") FROM "members" WHERE "nickname"='Billikens';