Who was the director for the episode in season #50?
CREATE TABLE "season_3_1998_99" (
  "series_num" real,
  "season_num" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text
);
SELECT "directed_by" FROM "season_3_1998_99" WHERE "series_num"=50;