bloor blorb blurb blurr bo-bo bobr bogor bogu bogur boll- bollo bollu booru borbo borgo borgu boro- boroo borou borro borul boul- boulo bourg brlog brobo broll brolo brool brrrr brugg brull bugol bugoo bulb- bull- bulou bulul burgo burgu burol buroo burro burru g-log ggulu globo glogg gloor glour glubb go-go go-lo go-oo gobbo gogol gogro gogul golbo gollu golob golog golol golub golug goobo gorgl gorgo gorlo gourl grgur grogg groll groul grrrl grrrr grubb gubbo gubru gugul gulo- gulou guroo gurro gurur lobbo lobo- lobor logo- logol lollo lolol loobu louro lubur lugol lulul luogu lurgg o-r-b oblog obolo oboro ogogo ogugu ollur olour ooooo orgul orobo orolu orrgo oruro oullo ouoro ourol ro-ro robbo robo- robor robur rollo rorbu roull rubor rullo ubobo ugro- ugrug ullur ululu uluru uroob urour urubu uuuuu