bbbb bblb bbpr blob bloo blop blou blub blup blur bobb bobo bobu boll bolo bolu boob bool boop boor bopp bor- boro borr boru boul boup bour bovo brlp brob brol broo bror brou brrr brup bruv bubb bubo bubu bulb bull bulu buol bur- burb burl buro burp burr buru lblr llll lloo lo-v lob- lobb lobo loll lolo loob lool loop loor lopp lopu loro loul loup lour louu lovo lppl lprp lrpu lrrr lull lulu lupo lupu lurv luup lvov lvrr obbo oblu obol obor obro olbo ollo olor olov olur oolo oooo opo- opor oppo orbb orbo orbu orlo orlu oro- oror orro orub orup orvr oulu oupv our- ouro ouu- ovo- ovol ovoo ovpp pblu plbr plob ploo plop plou plov plpp plup plur pobo poll polo polu pool poop poor pop- popo popp porb poro porr poul poup pour povl povo ppbv pplo pppo pppp ppru ppur prlr pro- prob prol proo prop prou prov pruu publ pubu pull pulo pulp pulu pulv pupl pupu pur- purb purl puro purp purr puru pvlv rbbb rbbr rob- robb robo robu roll rolo rolp roob rool roop roor ropo roro roru roub roul roup rovo rpob rrrr rubb rubp rubu rull rulo rupp ruro rurp ruru ruvu u-rp ubbo ublo ullo ullr ulo- ulul uor- uovo uplb uplo upor uppp uppu upup uro- urol uroo urpo urup urur uulu uuuu uv-b uvvu voll volo volp vool voor vor- voro voru voul vour vplp vpro vrbl vull vurb vurp vvob vvpb vvvv