bbbb bblb bbpr blob bloo blop blou blub blup blur bobb bobo bobu boll bolo bolu boob bool boop boor booz bopp bor- boro borr boru borz boul boup bour bozo brlp brob brol broo bror brou broz brrr brup bruz bubb bubo bubu bulb bull bulu bulz buol bur- burb burl buro burp burr buru burz buuz buzz bzou bzzz lblr lboz llll lloo lob- lobb lobo loll lolo lolz loob lool loop loor looz lopp lopu loro loul loup lour louu lppl lprp lrpu lrrr lull lulu lulz lupo lupu lurz luup lzop obbo oblu obol obor obro olbo ollo olor olur oolo oooo opo- opor oppo orbb orbo orbu orlo orlu oro- oror oroz orro orub orup orzo orzu oulu our- ouro ouu- ouzo ozlu pblu plbr plob ploo plop plou plpp plup plur pobo poll polo polu pool poop poor pop- popo popp porb poro porr porz poul poup pour pozo pplo pppo pppp ppru ppur prlr pro- prob prol proo prop prou proz pruu publ pubu pull pulo pulp pulu pupl pupu pur- purb purl puro purp purr puru puzo pzzl rbbb rbbr rob- robb robo robu roll rolo rolp roob rool roop roor rooz ropo roro roru roub roul roup rouz rozz rpob rrrr rubb rubp rubu rull rulo rupp ruro rurp ruru u-rp ubbo ublo ullo ullr ulo- ulul uor- uplb uplo upor uppp uppu upup uro- urol uroo urpo urup urur uruz uulu uuuu uzbl z-ro zobo zoll zolo zoo- zool zoop zopl zorb zoro zozo zozu zubo zubr zubu zull zulu zulz zuoz zurb zurr zuru zuul zuzu zzzz