bi-lo bibbo bibio bibri bilbi bilbo bili- billi billo billu bioul birol birou birur bloor blorb blurb blurr bo-bo bobbi bobr bobri boilo boiro boll- bolli bollo bollu booru borbo borio boro- boroo borou borro borul boul- bouli boulo bouri brill briou brobo broil broll brolo brool brrrr bruiu brull bruri bulb- bulbi buliu bull- bulli bulou bulul burio burli burol buroo burri burro burru ibbur ibibo ibill iiiii ilio- illui ilobu ilori ilulu ioooi ioooo iorio irill irobo irori irour iuliu liboi libor libri libro libru liliu lilli lillo lilou liour liril lirio lirui liubo liuli lobbo lobi- lobio lobir lobo- lobor loibl loilo lolli lollo lolol loobu lorio lorri louri louro lubur luiro lulli lulul lurio luuri o-r-b oblio oboli obolo oboro ollio ollur olour ooioo ooooo oribi orill oriol orobo orolu oruro ouir- oullo ouoro ourol ribbi ribo- rillo rioli riolo ro-ro robbi robbo robo- robor robur rollo rorbu roull rubbi rubio rubor ruili ruiru rulli rullo ubirr ubobo uiro ullur ululu uluru uroob urour urubu uruli ururi uuuuu