What type of state was Lu, when Yi was the ruler from the royal house of Ji?
CREATE TABLE "vassal_states" (
  "state" text,
  "type" text,
  "name" text,
  "title" text,
  "royal_house" text,
  "from" text
);
SELECT "type" FROM "vassal_states" WHERE "royal_house"='ji' AND "name"='yi' AND "state"='lu';