suchen [und] SGB RO 28-[12][0123456789][0123456789][0123456789]* or RO 28-3[012345678][0123456789][0123456789]* or RO 28-39[012345678][0123456789]* or RO 28-399[0123456789]* or RO 28-0[123456789][0123456789][0123456789]* or RO 28-00[123456789][0123456789]* or RO 28-000[123456789]*