bfrog bloor blorb bluff blufr blurb blurr bo-bo bobr boffo bogof bogor bogu bogur boll- bollo bollu booru borbo borgo borgu boro- boroo borou borro borul boul- boulo bourg brlog brobo broll brolo brool brrrr bruff brugg brull buffo bugol bugoo bulb- bull- bulou bulul burgo burgu burol buroo burro burru flogo floor floro floru flour fluff fluo- fluor flurb flurr fogbo foggo fogou follo forgo forro forur fougo fourb fourg fouro frugo fu-fu fugro fugug fullf fullo furbo furo- furor g-log ggulu globo gloff glogg gloor glour glubb gluff go-go go-lo go-oo gobbo gofor gogol gogro gogul golbo golfg golfo gollu golob golog golol golub golug goobo gooff gorgl gorgo gorlo goulf gourl grgur groff grogg groll groof grouf groul grrrl grrrr grubb gruff gubbo gubru gugul gulo- gulou guroo gurro gurur lobbo lobo- lobor lofou logo- logol lollo lolol loobu louro lubur lugol lulul luogu lurgg o-r-b oblog obolo oboro offof ofour ogogo ogugu ollur olour ooooo orfor orful orgul orobo orolu orrgo oruro oullo ouoro ourol ro-ro robbo robo- robor robur rofor rolfo rollo rorbu roull rubof rubor ruffo rufo- rufol rullo ubobo ufofu uforb ugoff ugro- ugrug ullur ululu uluru uroob urour urubu uuuuu