When did Prime Minister Agathe Uwilingiyimana's mandate end?
CREATE TABLE "list" (
  "name_a" text,
  "country" text,
  "office" text,
  "mandate_start" text,
  "mandate_end" text,
  "term_length" text
);
SELECT "mandate_end" FROM "list" WHERE "office"='prime minister' AND "name_a"='agathe uwilingiyimana';