What kind of Rarotongan has a Tahitian of /metua/?
CREATE TABLE "internal_correspondences" (
  "tongan" text,
  "niuean" text,
  "s_moan" text,
  "takuu" text,
  "tahitian" text,
  "rarotongan" text,
  "m_ori" text,
  "north_marquesan" text,
  "south_marquesan" text,
  "hawai_ian" text,
  "mangarevan" text
);
SELECT "rarotongan" FROM "internal_correspondences" WHERE "tahitian"='/metua/';