a-be aaaa aaab aaae aaar aaba aabb aabt aaea aaoe aaoo aara aare aaro aart aata aatt abaa abab abae abar abat abb- abba abbb abbe abbo abbr abbt abee aber abet aboa abob aboo abor abot abra abro abta aeer aer- aera aero aeta aeto aetr aett aoba aora aorb aort arab arae arar arat arba arbe area aree areo aret aroa arob aroe aroo aror arr- arra arre arro arrr arrt arta arte arto artr at-t ataa atab atae atar atat atea atee ateo ater atob atoe ator atot atra atre atro atta atte atto attr baaa baar baat baba babb babe babo babr baer bar- bara barb bare baro barr bart bata bate bato batt bbbb bbeb bbet bear beat beba bebb bebe bebo beeb beer beet beo- beor beot bera bere bero berr bert beta bete beto bett 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 brab brae brao brat brea breb bree breo brer bret broa brob broe broo bror brot brrr btaa btob btor btrt bttb eaba eara earb eare earo eart eata eate ebba ebbo ebbr eber eboe eboo ebor ebro eeea eeee eera eero eeta eete eora eore eota eoto erat erba erbb erbe ereb erer eret erob eroe eroo erra erre erro erta etat etbr etee eter etoe etra etre etro etta ette etto 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 orba orbb orbe orbo ore- orea oreb oreo orer oro- oroe oror orot orra orro orta orte orto otar otea otee oter oto- otoe otoo otor otra otre otro otta otte otto raab raat raba rabb rabe rabo raer raob rara rarb rare raro rata rate rato ratt rbbb rbbr rea- reae reao rear reat reba rebb rebe rebo reeb reet reot rera rere rero rert reta rete reto retr rett roab roar roat rob- roba robb robe robo robt roea roer roet roob roor root rora rore roro rort rota rote roto rotr rott rrat rrrr rtee taa- taar taat taba tabb tabe tabo taer taoa taor tara tarb tare taro tarr tart tata tatb tate tato tatr tatt tbar tbrb tbta tear teat teba tebo teer teet teor ter- tera tere tero terr teta tete teto tetr tett toab toat toba tobe tobo tobt toea toee toer toet tooa toor toot tora tore toro torr tort tota tote toto totr tott traa trab trae trao trat tre- trea tree treo tret troa troe troo trot trra trte trtr ttab ttbb tteo tter ttoe tttt