What is the average drawn of the team with a difference of 4 and more than 13 losses?
CREATE TABLE "campeonato_brasileiro_s_rie_b" (
  "position" real,
  "team" text,
  "points" real,
  "played" real,
  "drawn" real,
  "lost" real,
  "against" real,
  "difference" text
);
SELECT AVG("drawn") FROM "campeonato_brasileiro_s_rie_b" WHERE "difference"='4' AND "lost">13;