bbbb bbdd bbdo bblb bbrc bcbc bccc bccl bcor bcru bcuc bd-r bdbc bddc blcu bldc bldr blob bloc blod bloo blou blrc blub blud blur bobb bobo bobu boco bocu bodb bodo bodu bold boll bolo bolu boob booc bood bool boor bor- bord boro borr boru boud boul bour brcb brdo brob broc brod brol broo bror brou brrr bruc brud bubb bubo bubu bucc buco bucu budb budd budl budo budu bulb buld bull bulu buol bur- burb burd burl buro burr buru c-bo c-cd cbbc cbcc cbcl cbcr cbcu cbdb cbdc cbdo cblb cblc cbol cbrd cbrl ccbc cccb cccc cccl cccu ccdc ccdr cclc ccob ccoc ccod ccrc ccrl ccuc cd-r cddb cddl cddr clcd cldc cldr clob clod cloo clor clou clrd clro club clud cobb cobo cobu coco cocu codd codl col- colb cold coll colo colu coob cood cool cor- corb corc cord corl coro corr coub coud coul cour crbc crbu crcc crcr crdc crob croc crod crol croo cror crub crud cub- cubb cucc culb culc culd cull culo curb curd curl curo curr d-bo dbcc dcbc dccb dccc dccl dccu dcdb dddd ddlc ddoc ddrc ddub dlbd dlco dobb dobl dobu doco docu dod- dodd dodo dold doll dolo dolu doob dood dool door dorc dord doro dorr doru doub douc doud doul dour drbc drob drod drol drou drub druu dub- dubb dubc dubu duco dudd dudo dudu dulc dull dulo dulu duo- duro duru duul duur lbcc lblr lcbc lccc lcdd lcdr lcor lcrd lcrl llcc lldb lldc lllc llll lloc llod lloo llud lob- lobb lobo locc loco locu lold loll lolo loob looc lood lool loor lord loro loud loul lour louu lrdd lroc lrrc lrrr ludd ludo lull lulu lurd obbo oblu obol obor obro ocbc occc oclc ocrl ocro ocrr ocul ocur odbo oddd odoo odor odou odrl odur olbo olcc oldb ollo olor olur oocr oold oolo oooo oord orbb orbo orbu orco ordo ordu orlo orlu oro- oror orro orub oucc oudc ould oulu our- ouro ouu- rbbb rbbr rbcl rcbc rcbo rccb rccc rcdc rcrd rdoc rob- robb robo robu rocc roco rodd rodo rold roll rolo roob rood rool roor rorc roro roru roub roud roul rrrr rubb rubu rudd rudl rudo rull rulo rurc rurd ruro ruru ruud ubbo ublo uboc ubod ubud ucbc ucdc ucdd ucrc udbc udoo ulbc ulcc ulco ullo ullr ulo- uloc ulul uocc uolc uor- urdu uro- urol uroo urur uulu uuoc uuuu