bbbb bblb bbpr bbrc bcbc bcbp bccc bccl bcor bcpl bcpp bcru bcuc bcup blcu blob bloc bloo blop blou blrc blub blup blur bobb bobo bobu boco bocu boll bolo bolu boob booc bool boop boor bopp bor- boro borr boru boul boup bour bpcp bprc brcb brlp brob broc brol broo bror brou brrr bruc brup bubb bubo bubu bucc buco bucu bulb bull bulu buol bupc bur- burb burl buro burp burr buru c-bo cbbc cbcc cbcl cbcp cbcr cbcu cblb cblc cbol cbpc cbpp cbrl ccbc cccb cccc cccl cccp cccu cclc ccob ccoc ccpl ccpp ccpr ccrc ccrl ccrp ccuc ccup clob cloo clop clor clou clpb clpp clro club cobb cobo cobu coco cocp cocu col- colb coll colo colp colu coob cool coop copo copp copr cor- corb corc corl coro corp corr coub coul coup cour cpbc cpcu cplc crbc crbu crcc crcr crob croc crol croo crop cror crpc crub crup cub- cubb cucc culb culc cull culo culp cupl cupo cupp cupr curb curl curo curr lbcc lblr lcbc lccc lcor lcpc lcpl lcrl llcc lllc llll lloc lloo lob- lobb lobo locc loco locu loll lolo loob looc lool loop loor lopp lopu loro loul loup lour louu lppl lprp lroc lrpu lrrc lrrr lull lulu lupo lupu luup obbo oblu obol obor obro ocbc occc oclc ocpp ocrl ocro ocrr ocul ocur olbo olcc ollo olor olpc olur oocr oolo oooo opo- opor oppo orbb orbo orbu orco orlo orlu oro- oror orpc orro orub orup oucc oulu our- ouro ouu- pbcc pblu pboc pcbc pccc pccl pcll pclo pcpb pcpp pcrc pcrl plbr plcc plob ploc ploo plop plou plpp plup plur pobo poco poll polo polu pool poop poor pop- popc popo popp porb porc poro porr poul poup pour ppcc pplo pppo pppp pprc ppru ppur prbc prcc prcp prlr pro- prob proc prol proo prop prou pruu publ pubu pull pulo pulp pulu pupl pupu pur- purb purl puro purp purr puru puuc rbbb rbbr rbcl rcbc rcbo rccb rccc rcpo rob- robb robo robu rocc roco roll rolo rolp roob rool roop roor ropo rorc roro roru roub roul roup rpob rrrr rubb rubp rubu rull rulo rupp rurc ruro rurp ruru u-rp ubbo ublo uboc ubpc ucbc uccp ucpb ucrc ulbc ulcc ulco ullo ullr ulo- uloc ulul uocc uolc uor- uplb uplo upor uppc uppp uppu upup uro- urol uroo urpo urup urur uucp uulu uuoc uuuu