a-be aaaa aaab aaae aaar aaav aaba aabb aabt aaea aaev aaoe aaoo aara aare aaro aart aata aatt aava abaa abab abae abar abat abb- abba abbb abbe abbo abbr abbt abee aber abet aboa abob aboo abor abot abov abra abro abta abva aeer aer- aera aero aeta aeto aetr aett aeva aoba aora aorb aort arab arae arar arat arba arbe area aree areo aret arev aroa arob aroe aroo aror arr- arra arre arro arrr arrt arta arte arto artr artv arva arve arvo at-t ataa atab atae atar atat atea atee ateo ater atob atoe ator atot atra atre atro atta atte atto attr avab avao avar avat avea aveo aver avor avot avra avre avro avva avvo baaa baar baat baba babb babe babo babr baer bar- bara barb bare baro barr bart bata bate bato batt bava bave bbbb bbeb bbet bear beat beav beba bebb bebe bebo beeb beer beet beo- beor beot bera bere bero berr bert beta bete beto bett betv bevo boab boar boat boba bobb bobe bobo boea boee boeo boer boet boob booe boor boot bor- bora bore boro borr bort bota botb bote boto bott bova bove bovo brab brae brao brat brav brea breb bree breo brer bret brev broa brob broe broo bror brot brrr btaa btob btor btrt bttb eaba eara earb eare earo eart eata eate eave ebba ebbo ebbr eber eboe eboo ebor ebro eeea eeee eera eero eeta eete eeva eora eore eota eoto erat erba erbb erbe ereb erer eret erev erob eroe eroo erra erre erro erta erve etat etbr etee eter etoe etra etre etro etta ette etto etvo evae evar evat evea ever evet evoe evoo evra evre o-eo oaer oara oare oate obba obbo obea ober obet oboe obor obot obra obre obro oera oere oeta ooaa ooba oobe ooer oooo oora oore oort ootb orab orae orao orar orat orav orba orbb orbe orbo ore- orea oreb oreo orer oro- oroe oror orot orra orro orta orte orto orve orvr otar otea otee oter oto- otoe otoo otor otov otra otre otro otta otte otto ovar ovee over ovet ovo- ovoo ovot ovra ovre raab raat raba rabb rabe rabo raer raob rara rarb rare raro rata rate rato ratt rava rave rbbb rbbr rea- reae reao rear reat reba rebb rebe rebo reeb reet reev reot rera rere rero rert reta rete reto retr rett reva reve revo roab roar roat rob- roba robb robe robo robt roea roer roet roev roob roor root rora rore roro rort rota rote roto rotr rott rova rove rovo rrat rrrr rtee rtva rtve rver taa- taar taat taba tabb tabe tabo taer taoa taor tara tarb tare taro tarr tart tata tatb tate tato tatr tatt tatv tava tave tavo tbar tbrb tbta tear teat teba tebo teer teet teev teor ter- tera tere tero terr teta tete teto tetr tett teva toab toat toba tobe tobo tobt toea toee toer toet tooa toor toot tora tore toro torr tort torv tota tote toto totr tott tova tove tovo traa trab trae trao trat trav tre- trea tree treo tret trev troa troe troo trot trra trte trtr ttab ttbb tteo tter ttoe tttt tver tvro tvrr tvtv vaar vaat vara vare varr vart vata vate vato vatt vava vear veat veba veer veet veor ver- vera verb vere vero vert veta vete veto vetr veve vevo voar voat voer voet voor voot vor- vora vore voro vort vota vote voto vrav vrba vreo vret vrot vrto vver vvob vvvv