What is the Latin letter for the Tibetan of ས?
CREATE TABLE "cognates_of_core_hangul_letters" (
  "hangul" text,
  "phagspa" text,
  "tibetan" text,
  "phoenician" text,
  "greek" text,
  "latin" text
);
SELECT "latin" FROM "cognates_of_core_hangul_letters" WHERE "tibetan"='ས';