a-be a-do aaaa aaab aaad aaae aaar aaba aabb aabd aada aade aadu aaea aaoe aaoo aara aard aare aaro aaru abaa abab abad abae abar abau abb- abba abbb abbe abbo abbr abda abdo abdu abed abee aber aboa abob abod aboo abor abou abra abro abua abud abue adaa adab adad adae adao adar adba adda addd adde addo addr addu adea adeb adee adeo ader adob adod adoe adoo ador adra adre adro adua adub adue adur aede aeer aer- aera aerd aero aoba aoeu aora aorb arab arad arae arar arau arba arbe arda arde ardo ardu area ared aree areo areu aroa arob arod aroe aroo aror arr- arra arre arro arrr arru arua arub arud arue auaa aube aude audo auer aur- aura aurd aure auro baaa baad baar baba babb babe babo babr babu bada badb badd bade bado badr badu baed baer bar- bara barb bard bare baro barr baru bau- baud baur bbad bbau bbbb bbdd bbdo bbeb bd-r bead bear beau beba bebb bebe bebo beda bede bedo bedu beeb beed beer beo- beod beor bera berd bere bero berr beru beur boab boad boar boba bobb bobe bobo bobu boda bodb bode bodo bodu boea boee boeo boer boob bood booe boor bor- bora bord bore boro borr boru boua boud boue bour brab brad brae brao brau brda brdo brea breb bred bree breo brer broa brob brod broe broo bror brou brrr brud brue buad buar buba bubb bube bubo bubu buda budb budd bude budo budu buea buer bueu bur- bura burb burd bure buro burr buru d-bo daab daad daae daar daau daba dabb dabo dabu dada dade dado dadu daeb daer daeu daou dara darb dard dare daro darr daru daub daud daue daur dbar dddd ddre ddub dead deae dear deau deba debe debu deda dedd dede dedo dedu deeb deed deer deor der- dera derb dere dero derr deua deue deur doab doae doar doba dobb dobe dobu dod- doda dodd dode dodo doea doer doob dood door dora dord dore doro dorr doru doub doud doue dour draa drab drad drar drau drba drda drea dred dree drob drod drou drra drua drub drue druu duaa duab duad duar dub- duba dubb dube dubu duda dudd dude dudo dudu duer duo- dura dure duro duru duur eaba eada eadb eadd eara earb eard eare earo ebba ebbo ebbr ebed eber eboe eboo ebor ebro ebru ebur edad edar edda edde eddo ede- edea eder edod edou edra edru edur eede eedu eeea eeee eera eero eode eora eore erad erau erba erbb erbe erda erde ereb ered erer erob erod eroe eroo erra erre erro erua erub erur euba eude euer eur- eura eure euro o-eo oaau oade oaer oara oare obad obba obbo obea obed ober oboe obor obra obre obro odbo odda oddd odea oded odeo oder odoo odor odou odra odur oedo oera oere ooaa ooba oobe ooda ooer oooo oora oord oore orab orad orae orao orar orba orbb orbe orbo orbu orda orde ordo ordu ore- orea oreb ored oreo orer oro- oroe oror orra orro orub ouad oude ouea oued ouer our- oura oure ouro ouu- raab raad raba rabb rabe rabo rabu rada radd rade rado radr radu raed raer raob rara rarb rare raro raua raub raud raue rbbb rbbr rder rea- read reae reao rear reau reba rebb rebe rebo rebu reda redd rede redo redr redu reeb reed reod reou rera rerd rere rero reru reue reuu roab road roar rob- roba robb robe robo robu roda rodd rode rodo roea roed roer roob rood roor rora rore roro roru roua roub roud roue rrad rred rrrr ruad ruba rubb rube rubu ruda rudd rude rudo rued ruer rura rurd rure ruro ruru ruud uaru uaua ubar ubba ubbe ubbo uber ubod ubra ubud udaa udad udar udau udea uder udoo udra ueba ueda uor- uore urad urao urau urba urbe urda urde urdu ure- urea ured uro- uroa uroo urra urre urur uuuu