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 abax abb- abba abbb abbe abbo abbr abbt abee aber abet abff aboa abob abof aboo abor abot abox abra abro abta aeaf aeer aer- aera aero aeta aetf aeto aetr aett aetx afaa afao afar afat afee afer afet affa affo afft afoa afoe afoo afor afox afr- afra afre afro afta afte afxe aoba aora aorb aort aotf arab arae araf arar arat arax arba arbe area aree aref areo aret arex arfa arfb arff arft aroa arob aroe aroo aror arr- arra arre arro arrr arrt arta arte arto artr artx at-t at-x ataa atab atae atar atat atax atea atee atef ateo ater atex atfb atfe atob atoe atof ator atot atra atre atro atrx atta atte atto attr axaf axar axat axer axfr axo- axoa axof axto axxo ba-x baaa baaf baar baat baba babb babe babo babr baer baff bafo baft bar- bara barb bare barf baro barr bart barx bata bate batf bato batt baxt bbbb bbeb bbet bbox 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 boox bor- bora bore borf boro borr bort bota botb bote boto bott boxa brab brae braf brao brat brax brea breb bree bref breo brer bret brex broa brob broe broo bror brot brox brrr btaa btaf btex btob btor btrt bttb eaaf eaba eafb eara earb eare earo eart eata eate ebba ebbo ebbr eber eboe eboo ebor ebox ebro eeea eeee eefa eefe eera eero eeta eete eext efab efax efbr efeo efet effa efor eft- efta eora eore eota eoto er-x eraf erat erba erbb erbe ereb erer eret erft erfx erob eroe eroo erra erre erro erta etat etbr etee eter etfa etfb etfe etoe etox etra etre etro etta ette etto exa- exer exfo exo- exor exrx exta exte extr faaa faba fabe fabo faeb faex fafa fafe faff fafo fara farb fare faro farr fart fata fate fatf fato fatt faxe fbar feaf fear feat feba febo feeb feer feet fefe feff fefo feof fera ferb fere fero ferr fert feta fete fetr fett fext ffar ffee ffff ffrr fftf foaf foar foba fobt foer fofo foof foot for- fora forb fore foro forr fort fota fote foto fott foxe foxx frab frae frat frax frea free freo fret frex frob froe frot frta ftea fter o-eo oaer oafo oara oare oate obba obbo obea ober obet obex oboe obor obot obox obra obre obro oeax 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 orex 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 oxa- oxea oxer oxo- oxof oxox oxxo raab raaf raat raba rabb rabe rabo raef raer rafa rafe raff raft raob rara rarb rare rarf raro rata rate ratf rato ratt raxa 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 rexx rfae rfef roab roaf roar roat rob- roba robb robe robo robt roea roer roet rofe roff rofo roob roof roor root roox rora rore roro rort rota rote roto rotr rott roxa roxo rrat rrrr rtbf rtee rtex 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 tax- taxa taxe taxf taxo taxt tbaf tbar tbox tbrb tbta tear teat teba tebo teef teer teet teff teft teor ter- tera tere terf tero terr teta tete teto tetr tett tetx texa text tfae tfeb tfot tfox toab toat toba tobe tobo tobt toea toee toer toet tofa toff tofo toft tooa toof toor toot tora tore torf toro torr tort torx tota tote toto totr tott tox- toxa toxo toxt traa trab trae traf trao trat trax tre- trea tree tref treo tret trex trfr troa troe troo trot trox trra trte trtr ttab ttbb tteo tter ttfa ttff ttoe tttt txaa txtr xaar xara xare xate xbar xbee xbox xbra xeer xefe xer- xera xero xert xexe xfer xoro xote xoxo xtar xtea xtra xtro xxxo xxxx