Which Last Aired has a Retitled as/Same of classic concentration?
CREATE TABLE "programs_returning_in_1987" (
  "show" text,
  "last_aired" real,
  "previous_network" text,
  "retitled_as_same" text,
  "new_returning_same_network" text,
  "returning" text
);
SELECT "last_aired" FROM "programs_returning_in_1987" WHERE "retitled_as_same"='classic concentration';