What city has a team in IHSAA class 3a, and previous conference of lake?
CREATE TABLE "membership" (
  "school" text,
  "city" text,
  "team_name" text,
  "enrollment_08_09" real,
  "ihsaa_class" text,
  "county" text,
  "year_joined" text,
  "previous_counference" text
);
SELECT "city" FROM "membership" WHERE "previous_counference"='lake' AND "ihsaa_class"='3a';