suchen [und] SGB OA 09-[123][0123456789][0123456789][0123456789]* or OA 09-4[012345678][0123456789][0123456789]* or OA 09-49[012345678][0123456789]* or OA 09-499[0123456789]* or OA 09-0[123456789][0123456789][0123456789]* or OA 09-00[123456789][0123456789]* or OA 09-000[123456789]*