a-be aaaa aaab aaae aaar aaav aaba aabb aabt aaea aaev aara aare aart aata aatt aava abaa abab abae abar abat abb- abba abbb abbe abbr abbt abee aber abet abra abta abva aeer aer- aera aeta aetr aett aeva arab arae arar arat arba arbe area aree aret arev arr- arra arre arrr arrt arta arte artr artv arva arve at-t ataa atab atae atar atat atea atee ater atra atre atta atte attr avab avar avat avea aver avra avre avva baaa baar baat baba babb babe babr baer bar- bara barb bare barr bart bata bate batt bava bave bbbb bbeb bbet bear beat beav beba bebb bebe beeb beer beet bera bere berr bert beta bete bett betv brab brae brat brav brea breb bree brer bret brev brrr btaa btrt bttb eaba eara earb eare eart eata eate eave ebba ebbr eber eeea eeee eera eeta eete eeva erat erba erbb erbe ereb erer eret erev erra erre erta erve etat etbr etee eter etra etre etta ette evae evar evat evea ever evet evra evre raab raat raba rabb rabe raer rara rarb rare rata rate ratt rava rave rbbb rbbr rea- reae rear reat reba rebb rebe reeb reet reev rera rere rert reta rete retr rett reva reve rrat rrrr rtee rtva rtve rver taa- taar taat taba tabb tabe taer tara tarb tare tarr tart tata tatb tate tatr tatt tatv tava tave tbar tbrb tbta tear teat teba teer teet teev ter- tera tere terr teta tete tetr tett teva traa trab trae trat trav tre- trea tree tret trev trra trte trtr ttab ttbb tter tttt tver tvrr tvtv vaar vaat vara vare varr vart vata vate vatt vava vear veat veba veer veet ver- vera verb vere vert veta vete vetr veve vrav vrba vret vver vvvv