What was the date of the inauguration in the row with an entry of lifespan in the lifespan column?
CREATE TABLE "list" (
  "president" text,
  "date_of_birth" text,
  "date_of_inauguration" text,
  "age_at_inauguration" text,
  "end_of_term" text,
  "length_of_retirement" text,
  "date_of_death" text,
  "lifespan" text
);
SELECT "date_of_inauguration" FROM "list" WHERE "lifespan"='lifespan';