CREATE TABLE "round_six" (
  "pick_num" real,
  "mls_team" text,
  "player" text,
  "position" text,
  "affiliation" text
);

Question: Tell me the affiliation for pick number less than 59 and position of gk
SQL: SELECT "affiliation" FROM "round_six" WHERE "pick_num"<59 AND "position"='gk';