When the round of 32 was n/a and quarterfinal was did not advance, what was the round of 16?
CREATE TABLE "boxing" (
  "athlete" text,
  "event" text,
  "round_of_32" text,
  "round_of_16" text,
  "quarterfinal" text,
  "semifinal" text,
  "final" text
);
SELECT "round_of_16" FROM "boxing" WHERE "quarterfinal"='did not advance' AND "round_of_32"='n/a';