Which country is ranked 56 overall and has a heat rank smaller than 8?
CREATE TABLE "heats" (
  "heat_rank" real,
  "lane" real,
  "swimmer" text,
  "country" text,
  "time" real,
  "overall_rank" text
);
SELECT "country" FROM "heats" WHERE "heat_rank"<8 AND "overall_rank"='56';