bbbb bbdd bbdo bbeb bbrc bcbc bccc bcde bcec bcer bcor bcru bcuc bd-r bdbc bddc bebb bebe bebo becu bede bedo bedu beeb beed beer beo- beod beor berc berd bere bero berr beru beur bobb bobe bobo bobu boce boco bocu bodb bode bodo bodu boec boee boeo boer boob booc bood booe boor bor- bord bore boro borr boru boud boue bour brcb brce brdo breb brec bred bree breo brer brob broc brod broe broo bror brou brrr bruc brud brue bubb bube bubo bubu bucc buce buco bucu budb budd bude budo budu buer bueu bur- burb burd bure buro burr buru c-bo c-cd cbbc cbcc cbce cbcr cbcu cbdb cbdc cbdo cbec cbee cber cbrd cbre ccbc cccb cccc cccu ccdc ccdr cced ccee ccob ccoc ccod ccrc ccre ccuc cd-e cd-r cddb cddr cdec cder cdre cebu cec- cece ceco cedd cede cedo cedu ceeb ceec ceor ceou cer- cerc cerd cere cero cobb cobe cobo cobu coce coco cocu codd code coed coob cood cor- corb corc cord core coro corr coub coud coue cour crbc crbu crcc crce crcr crdc cre- creb crec cred cree creo creu crob croc crod croe croo cror crub crud crue cub- cubb cube cucc cuce cude cued cuer curb curd cure curo curr d-bo dbcc dcbc dccb dccc dccu dcdb dddd ddoc ddrc ddre ddub debe debu dec- decc decd dece deco dedd dede dedo dedu deeb deed deer deor der- derb derc dere dero derr deue deur dobb dobe dobu doce doco docu dod- dodd dode dodo doer doob dood door dorc dord dore doro dorr doru doub douc doud doue dour drbc dred dree drob drod drou drub drue druu dub- dubb dubc dube dubu duce duco dudd dude dudo dudu duer duo- dure duro duru duur ebbc ebbo ebbr ebcc ebed eber eboe eboo ebor ebro ebru ebur ecbc ecbe eccb eccc ecce ecco ecdc eced eco- ecod ecou ecrc ecrr ecru eddc edde eddo ede- eder edoc edod edou edru educ edur eede eedu eeee eeoc eerc eero eocd eode eore erbb erbe ercc erce erde ereb erec ered erer erob eroc erod eroe eroo errc erre erro erub eruc erur eubc eucd eude euer eur- eurc eure euro o-eo obbo obec obed ober oboe obor obre obro ocbc occc oce oced ocee ocre ocro ocrr ocur odbo oddd oded odeo oder odoo odor odou odur oec- oecc oedo oeec oere oobe oocr ooer oooo oord oore orbb orbe orbo orbu orce orco orde ordo ordu ore- oreb orec ored oreo orer oro- oroe oror orro orub oucc oudc oude oued ouer our- oure ouro ouu- rbbb rbbr rcbc rcbo rccb rccc rcdc rcde rcrd rder rdoc rebb rebe rebo rebu recc recd rece recr recu redc redd rede redo redr redu reeb reed reod reou rerd rere rero reru reue reuu rob- robb robe robo robu rocc roce roco rodd rode rodo roed roer roob rood roor rorc rore roro roru roub roud roue rred rrrr rubb rube rubu ruce rudd rude rudo rued ruer rurc rurd rure ruro ruru ruud ubbe ubbo uber uboc ubod ubud ucbc ucdc ucdd ucrc udbc uder udoo uocc uor- uore urbe urde urdu ure- ured uro- uroo urre urur uuoc uuuu