What is the Kana of the Province with a Korean name of Chungcheong-Namdo?
CREATE TABLE "provinces_under_japanese_colonial_rule" (
  "japanese_name" text,
  "kana" text,
  "hanja_kanji" text,
  "korean_name" text,
  "hangul" text
);
SELECT "kana" FROM "provinces_under_japanese_colonial_rule" WHERE "korean_name"='chungcheong-namdo';