a-be a-do aaaa aaab aaad aaae aaar aaav aaba aabb aabd aada aade aaea aaev aaoe aaoo aara aard aare aaro aava abaa abab abad abae abar abb- abba abbb abbe abbo abbr abda abdo abed abee aber aboa abob abod aboo abor abov abra abro abva abvd 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 advb aede aeer aer- aera aerd aero aeva aoba aora aorb arab arad arae arar arba arbe arda arde ardo area ared aree areo arev aroa arob arod aroe aroo aror arr- arra arre arro arrr arva arve arvo avab avao avar avda avea aveo aver avor avra avre avro avva avvo baaa baad baar baba babb babe babo babr bada badb badd bade bado badr baed baer bar- bara barb bard bare baro barr bava bave bbad bbbb bbdd bbdo bbeb bd-r bdav bead bear beav beba bebb bebe bebo beda bede bedo beeb beed beer beo- beod beor bera berd bere bero berr bevo 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 bova bove bovo brab brad brae brao brav brda brdo brea breb bred bree breo brer brev 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 dava dave dbar dddd ddre dead deae dear deba debe deda dedd dede dedo deeb deed deer deev deor der- dera derb dere dero derr derv deva deve devo doab doae doar doba dobb dobe dod- doda dodd dode dodo doea doer doob dood door dora dord dore doro dorr dove draa drab drad drar drba drda drea dred dree drev drob drod drra dvar dvda dvdr dvoa dvor dvra eaba eada eadb eadd eara earb eard eare earo eave ebba ebbo ebbr ebed eber eboe eboo ebor ebro edad edar edda edde eddo ede- edea eder edod edra edve eede eeea eeee eera eero eeva eode eora eore erad erba erbb erbe erda erde ereb ered erer erev erob erod eroe eroo erra erre erro erve evae evar evdb evea ever evoe evoo evra evre 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 odva oedo oera oere ooaa ooba oobe ooda ooer oooo oora oord oore orab orad orae orao orar orav orba orbb orbe orbo orda orde ordo ore- orea oreb ored oreo orer oro- oroe oror orra orro orve orvr ovar ovda ovde ovee over ovo- ovod ovoo ovra ovre raab raad raba rabb rabe rabo rada radd rade rado radr raed raer raob rara rarb rare raro rava rave rbbb rbbr rder rdev rea- read reae reao rear reba rebb rebe rebo reda redd rede redo redr reeb reed reev reod rera rerd rere rero reva revd reve revo roab road roar rob- roba robb robe robo roda rodd rode rodo roea roed roer roev roob rood roor rora rore roro rova rove rovo rrad rred rrrr rved rver vaad vaar vada vade vado vara vard vare varr vava vder vdre vear veba veda vede vedo veer veor ver- vera verb verd vere vero veve vevo voad voar voda vode vodo voer voor vor- vora vord vore voro vrav vrba vred vreo vver vvob vvvv