a-be aaaa aaab aaae aaaf aaar aaba aabb aabt aaea aafa aafb aaff aaoe aaoo aara aare aaro aart aata aatf aatt abaa abab abae abaf abar abat abb- abba abbb abbe abbo abbr abbt abee aber abet abff aboa abob abof aboo abor abot abra abro abta aeaf aeer aer- aera aero aeta aetf aeto aetr aett afaa afao afar afat afee afer afet affa affo afft afoa afoe afoo afor afr- afra afre afro afta afte aoba aora aorb aort aotf arab arae araf arar arat arba arbe area aree aref areo aret arfa arfb arff arft aroa arob aroe aroo aror arr- arra arre arro arrr arrt arta arte arto artr at-t ataa atab atae atar atat atea atee atef ateo ater atfb atfe atob atoe atof ator atot atra atre atro atta atte atto attr baaa baaf baar baat baba babb babe babo babr baer baff bafo baft bar- bara barb bare barf baro barr bart bata bate batf bato batt bbbb bbeb bbet beaf bear beat beba bebb bebe bebo beeb beef beer beet befa befe beff befo beft beo- beof beor beot bera bere bero berr bert beta bete beto bett bfta bftt boab boar boat boba bobb bobe bobo boea boee boef boeo boer boet bofa bofe boff boob booe boof boor boot bor- bora bore borf boro borr bort bota botb bote boto bott brab brae braf brao brat brea breb bree bref breo brer bret broa brob broe broo bror brot brrr btaa btaf btob btor btrt bttb eaaf eaba eafb eara earb eare earo eart eata eate ebba ebbo ebbr eber eboe eboo ebor ebro eeea eeee eefa eefe eera eero eeta eete efab efbr efeo efet effa efor eft- efta eora eore eota eoto eraf erat erba erbb erbe ereb erer eret erft erob eroe eroo erra erre erro erta etat etbr etee eter etfa etfb etfe etoe etra etre etro etta ette etto faaa faba fabe fabo faeb fafa fafe faff fafo fara farb fare faro farr fart fata fate fatf fato fatt fbar feaf fear feat feba febo feeb feer feet fefe feff fefo feof fera ferb fere fero ferr fert feta fete fetr fett ffar ffee ffff ffrr fftf foaf foar foba fobt foer fofo foof foot for- fora forb fore foro forr fort fota fote foto fott frab frae frat frea free freo fret frob froe frot frta ftea fter o-eo oaer oafo oara oare oate obba obbo obea ober obet oboe obor obot obra obre obro oera oere oeta ofer off- offa offe offo offr ofor ofra ofre ofta ooaa ooba oobe ooer ooff oooo oora oore oort ootb orab orae orao orar orat orba orbb orbe orbo ore- orea oreb oreo orer orfe orff oro- oroe orof oror orot orra orro orta orte orto otar otea otee oter oto- otoe otof otoo otor otra otre otro otta otte otto raab raaf raat raba rabb rabe rabo raef raer rafa rafe raff raft raob rara rarb rare rarf raro rata rate ratf rato ratt rbaf rbbb rbbr rea- reae reaf reao rear reat reba rebb rebe rebo reeb reef reet refe reff refr reft reof reot rera rere rero rert reta rete reto retr rett rfae rfef roab roaf roar roat rob- roba robb robe robo robt roea roer roet rofe roff rofo roob roof roor root rora rore roro rort rota rote roto rotr rott rrat rrrr rtbf rtee rtfb taa- taaf taar taat taba tabb tabe tabo taer tafa tafe taff tafo taft taoa taor tara tarb tare tarf taro tarr tart tata tatb tate tato tatr tatt tbaf tbar tbrb tbta tear teat teba tebo teef teer teet teff teft teor ter- tera tere terf tero terr teta tete teto tetr tett tfae tfeb tfot toab toat toba tobe tobo tobt toea toee toer toet tofa toff tofo toft tooa toof toor toot tora tore torf toro torr tort tota tote toto totr tott traa trab trae traf trao trat tre- trea tree tref treo tret trfr troa troe troo trot trra trte trtr ttab ttbb tteo tter ttfa ttff ttoe tttt