For the light heavyweight –81 kg event that did not advance to semifinal, who was the athlete?
CREATE TABLE "boxing" (
  "athlete" text,
  "event" text,
  "round_of_32" text,
  "round_of_16" text,
  "quarterfinal" text,
  "semifinal" text,
  "final" text
);
SELECT "athlete" FROM "boxing" WHERE "semifinal"='did not advance' AND "event"='light heavyweight –81 kg';