What is the lower turnout that has a byut of 50.7 and an ou psd smaller than 36.8?
CREATE TABLE "support_of_leading_parties_and_blocs_by_" (
  "region" text,
  "voter_registration" real,
  "voter_turnout" real,
  "b_yu_t" real,
  "ou_psd" real
);
SELECT MIN("voter_turnout") FROM "support_of_leading_parties_and_blocs_by_" WHERE "b_yu_t"=50.7 AND "ou_psd"<36.8;