When was the parliament that was elected in 1509/10, and had an unknown second member, dissolved?
CREATE TABLE "parliaments_of_king_henry_viii" (
  "elected" text,
  "assembled" text,
  "dissolved" text,
  "1st_member" text,
  "2nd_member" text
);
SELECT "dissolved" FROM "parliaments_of_king_henry_viii" WHERE "2nd_member"='unknown' AND "elected"='1509/10';