a-be a-do aaaa aaab aaad aaae aaar aaba aabb aabd aada aade aaea aaoe aaoo aara aard aare aaro abaa abab abad abae abar abb- abba abbb abbe abbo abbr abda abdo abed abee aber aboa abob abod aboo abor abra abro adaa adab adad adae adao adar adba adda addd adde addo addr adea adeb adee adeo ader adob adod adoe adoo ador adra adre adro aede aeer aer- aera aerd aero aoba aora aorb arab arad arae arar arba arbe arda arde ardo area ared aree areo aroa arob arod aroe aroo aror arr- arra arre arro arrr baaa baad baar baba babb babe babo babr bada badb badd bade bado badr baed baer bar- bara barb bard bare baro barr bbad bbbb bbdd bbdo bbeb bd-r bead bear beba bebb bebe bebo beda bede bedo beeb beed beer beo- beod beor bera berd bere bero berr boab boad boar boba bobb bobe bobo boda bodb bode bodo boea boee boeo boer boob bood booe boor bor- bora bord bore boro borr brab brad brae brao brda brdo brea breb bred bree breo brer broa brob brod broe broo bror brrr d-bo daab daad daae daar daba dabb dabo dada dade dado daeb daer dara darb dard dare daro darr dbar dddd ddre dead deae dear deba debe deda dedd dede dedo deeb deed deer deor der- dera derb dere dero derr doab doae doar doba dobb dobe dod- doda dodd dode dodo doea doer doob dood door dora dord dore doro dorr draa drab drad drar drba drda drea dred dree drob drod drra eaba eada eadb eadd eara earb eard eare earo ebba ebbo ebbr ebed eber eboe eboo ebor ebro edad edar edda edde eddo ede- edea eder edod edra eede eeea eeee eera eero eode eora eore erad erba erbb erbe erda erde ereb ered erer erob erod eroe eroo erra erre erro o-eo oade oaer oara oare obad obba obbo obea obed ober oboe obor obra obre obro odbo odda oddd odea oded odeo oder odoo odor odra oedo oera oere ooaa ooba oobe ooda ooer oooo oora oord oore orab orad orae orao orar orba orbb orbe orbo orda orde ordo ore- orea oreb ored oreo orer oro- oroe oror orra orro raab raad raba rabb rabe rabo rada radd rade rado radr raed raer raob rara rarb rare raro rbbb rbbr rder rea- read reae reao rear reba rebb rebe rebo reda redd rede redo redr reeb reed reod rera rerd rere rero roab road roar rob- roba robb robe robo roda rodd rode rodo roea roed roer roob rood roor rora rore roro rrad rred rrrr