bloop bloor blorb blorp blurb blurr bo-bo bobov bobr bobup boll- bollo bollu booru borbo boro- boroo borou borov borro borul borup borvo boul- boulo brobo broll brolo brool brrrr brull bulb- bull- bulou bulul burol buroo burov burro burru l-pop lobbo lobo- lobor lobov lollo lolol loobu lopou lorup louro lovro lubov lubur lulov lulul lupul lurup lvovo o-r-b obolo oboro obrov ollup ollur olour olovo ooooo oovoo oploo opobo opovo oppol orlop orlov orobo orolu oruro oullo ouoro ourol ovolo ploop plopp plopu plupp po-po polbo pollo pollu polop polur polvo poopo poplr popop popov poppo popup poro- porro porur poulp povvo prlov probo proll prolo proor prop- propl propp propr provo pubo- pull- pullu puppo puro- purul ro-ro robbo robo- robop robor robur rollo rorbu roull rprop rubor rubup rullo u-pop ubobo ullur uloop ulpur ululu uluru upolo upolu uroob urour urubu uuuuu uvrou v-bob v-bor v-pop volvo voobu vooru vorup voulu vprbp vrbov vulv-