a-be aaaa aaab aaae aaap aaar aaba aabb aabp aabt aaea aaep aaoe aaoo aapa aapo aapt aara aare aaro aarp aart aata aatt abaa abab abae abap abar abat abb- abba abbb abbe abbo abbr abbt abee aber abet aboa abob aboo abor abot abpa abpp abpr abra abro abta aeap aeer aer- aera aero aeta aeto aetr aett aoba aopo aora aorb aort apao apap apar apat apba apbr apea apep aper apet apo- apoe apoo apop apor apot appa appr appt apra apre apro aprt apta apte aptt arab arae arap arar arat arba arbe area aree areo arep aret aroa arob aroe aroo aror arpa arpe arr- arra arre arro arrr arrt arta arte arto artr at-t ataa atab atae atap atar atat atea atee ateo atep ater atob atoe atop ator atot atpr atra atre atro atrp atta atte atto attp attr baaa baar baat baba babb babe babo babr baer bapa bape bapp bapt bar- bara barb bare baro barr bart bata bate bato batt bbbb bbeb bbet bbpr beap bear beat beba bebb bebe bebo beeb beep beer beet beo- beor beot bepo bera bere bero berr bert beta bete beto bett boab boar boat boba bobb bobe bobo boea boee boeo boep boer boet boob booe boop boor boot bopa bope bopp bor- bora bore boro borr bort bota botb bote boto bott bpea bpoe bpot brab brae brao brat brea breb bree breo brep brer bret broa brob broe broo bror brot brrr btaa btbp btob btor btrt bttb eaba eaop eapp eara earb eare earo earp eart eata eate ebba ebbo ebbr eber eboe eboo ebor ebpo ebro eeea eeee eera eero eeta eete eora eore eota eoto epaa epee eper epor epot eppa eppo eppp epra eprb epro eprp epta epte erap erat erba erbb erbe ereb erer eret erob eroe eroo erpa erpe erra erre erro erta etap 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 oepa oera oere oeta ooaa ooba oobe ooer oooo oora oore oort ootb ootp opap opar opep oper opet opo- opor oppa oppo opra opto orab orae orao orar orat orba orbb orbe orbo ore- orea oreb oreo orer oro- oroe oror orot orpe orra orro orta orte orto otap otar otea otee otep oter oto- otoe otoo otor otpp otra otre otro otta otte otto paap paar paat paba pabt paea paep paer papa papb pape papp papr par- para pare paro parp parr part pata pate pato patr patt pbar pbpa peab peap pear peat peba peep peer peet peor pepa pepe pepo per- pera pere pero perp perr pert peta pete peto petr pett poar poat poba pobo poea poer poet poop poor poot pop- popa pope popo popp popt pora porb pore poro porr port pota pote poto pott ppap ppar pper ppoa pppa pppo pppp ppta pptt prae prao prar prat pre- preb pree prep pret pro- proa prob proe proo prop prot prtp prtr ptab pter ptop raab raat raba rabb rabe rabo raep raer raob raop rapa rape rapp rapt rara rarb rare raro rata rate rato ratp ratt rbbb rbbr rea- reae reao reap rear reat reba rebb rebe rebo reeb reep reet reop reot repe repo repp repr rept rera rere rero rert reta rete reto retr rett roab roap roar roat rob- roba robb robe robo robt roea roer roet roob roop roor root ropa rope ropo rora rore roro rort rota rote roto rotr rott rpet rpob rpoe rpta rrat rrrr rtee rtpa rttp taa- taar taat taba tabb tabe tabo taer taoa taor tapa tape tapo tapp tapr tapt tara tarb tare taro tarp tarr tart tata tatb tate tato tatr tatt tbar tbrb tbta tbtp tear teat teba tebo teer teet teor tepa tepe tepp ter- tera tere tero terp terr teta tete teto tetr tett toab toat toba tobe tobo tobt toea toee toer toet tooa toor toot top- topa tope topo topp topt tora tore toro torp torr tort tota tote toto totr tott tpap tper tppa tppp tppr tpte tptp tptr traa trab trae trao trap trat tre- trea tree treo tret troa troe troo trop trot trpa trpe trpp trra trte trtr ttab ttbb tteo tter ttoe ttop tttt