What are the main places for the streymoy region with an area of larger than 6.1?
CREATE TABLE "population_by_island" (
  "name" text,
  "area" real,
  "inhabitants" real,
  "people_per_km" real,
  "main_places" text,
  "regions" text
);
SELECT "main_places" FROM "population_by_island" WHERE "regions"='streymoy' AND "area">6.1;