What is the elevation of Vanuatu, when the rank is smaller than 3?
CREATE TABLE "the_six_s_ultra_prominent_summit_of_the_" (
  "rank" real,
  "peak" text,
  "country" text,
  "island" text,
  "elevation_m" real,
  "col_m" real
);
SELECT AVG("elevation_m") FROM "the_six_s_ultra_prominent_summit_of_the_" WHERE "country"='vanuatu' AND "rank"<3;