CREATE TABLE "notes" (
  "hangul" text,
  "hanja" text,
  "revised" text,
  "mc_cune_reischauer" text,
  "estimated_distribution_2000" real
);

Question: Tell me the revised of mccune reischauer of yŏn (s) ryŏn (n)
SQL: SELECT "revised" FROM "notes" WHERE "mc_cune_reischauer"='yŏn (s) ryŏn (n)';

Question: Name the hanja for hangul of 주
SQL: SELECT "hanja" FROM "notes" WHERE "hangul"='주';

Question: Tell me the hanja of eum
SQL: SELECT "hanja" FROM "notes" WHERE "revised"='eum';