How many draws were there when there were points less than 23, 6 losses, and more than 21 against?
CREATE TABLE "campeonato_brasileiro_s_rie_a" (
  "position" real,
  "team" text,
  "points" real,
  "played" real,
  "drawn" real,
  "lost" real,
  "against" real,
  "difference" text
);
SELECT COUNT("drawn") FROM "campeonato_brasileiro_s_rie_a" WHERE "points"<23 AND "lost"=6 AND "against">21;