a-be aaaa aaab aaae aaap aaba aabb aabp aabt aaea aaep aaoe aaoo aapa aapo aapt aata aatt abaa abab abae abap abat abax abb- abba abbb abbe abbo abbt abee abet aboa abob aboo abot abox abpa abpp abta aeap aeta aeto aett aetx aoba aopo apao apap apat apax apba apea apep apet apex apo- apoe apoo apop apot apox appa appt appx apta apte aptt aptx at-t at-x ataa atab atae atap atat atax atea atee ateo atep atex atob atoe atop atot atta atte atto attp axat axo- axoa axto axxo ba-x baaa baat baba babb babe babo bapa bape bapp bapt bata bate bato batt baxt bbbb bbeb bbet bbox beap beat beba bebb bebe bebo beeb beep beet beo- beot bepo beta bete beto bett boab boat boba bobb bobe bobo boea boee boeo boep boet boob booe boop boot boox bopa bope bopp bota botb bote boto bott boxa bpea bpoe bpot btaa btbp btex btob bttb eaba eaop eapp eata eate ebba ebbo eboe eboo ebox ebpo eeea eeee eeta eete eext eota eoto epaa epee epot epox eppa eppo eppp epta epte epxp etap etat etee etoe etox etta ette etto exa- exo- expo expt exta exte o-eo oate obba obbo obea obet obex oboe obot obox oeax oepa oeta ooaa ooba oobe oooo ootb ootp opap opep opet opex opo- oppa oppo opto otap otea otee otep oto- otoe otoo otpp otta otte otto oxa- oxea oxep oxo- oxox oxxo paap paat paba pabt pabx paea paep paox papa papb pape papp pata pate pato patt paxo pbpa peab peap peat peax peba peep peet pepa pepe pepo peta pete peto pett poat poba pobo poea poet poop poot pop- popa pope popo popp popt pota pote poto pott ppap ppoa pppa pppo pppp ppta pptt ptab ptop ptox taa- taat taba tabb tabe tabo taoa tapa tape tapo tapp tapt tata tatb tate tato tatt tax- taxa taxe taxo taxt tbox tbta tbtp teat teba tebo teet tepa tepe tepp teta tete teto tett tetx texa text toab toat toba tobe tobo tobt toea toee toet tooa toot top- topa tope topo topp topt tota tote toto tott tox- toxa toxo toxt tpap tppa tppp tpte tptp ttab ttbb tteo ttoe ttop tttt txaa xapo xate xbee xbox xexe xote xoxo xpax xpot xpto xtea xtep xxxo xxxx