Who is the original operator for the AG Vulcan builder and the Prinzess Irene ship?
CREATE TABLE "the_ships" (
  "ship" text,
  "tonnage" text,
  "builder" text,
  "original_operator" text,
  "fate" text
);
SELECT "original_operator" FROM "the_ships" WHERE "builder"='ag vulcan' AND "ship"='prinzess irene';