bbbee be-er bebel beber beebe beele belee bellb belle belue belur berbe berel berle berre berru beuer beule beure bleer blere bleue bluer blurb blure blurr brebu breel breer brell brere breu- brrrr bruer brule brull bubbe buber buble buell bulb- bull- bulle bulul burel burle burru ebber ebble ebell eberl eblul ebull ebure eeeee eeler elele ellel eller ellul elulu eluru erbbe erber erere euell euler eurel eurre lebel leber leell leere leleu lelle lerer lubbe luber luble lubur lulle lulul lurer lurue rebbe rebel reber reere relee relue rere- reree reuel reuer reule rubee rubel ruber ruble ruele ruell ruere ruler ruule ubble uber- ullur ululu uluru urelu urubu uuuuu