a-be aaaa aaab aaae aaar aaba aabb aabt aaea aara aare aart aata aatt abaa abab abae abar abat abb- abba abbb abbe abbr abbt abee aber abet abra abta aeer aer- aera aeta aetr aett arab arae arar arat arba arbe area aree aret arr- arra arre arrr arrt arta arte artr at-t ataa atab atae atar atat atea atee ater atra atre atta atte attr baaa baar baat baba babb babe babr baer bar- bara barb bare barr bart bata bate batt bbbb bbeb bbet bear beat beba bebb bebe beeb beer beet bera bere berr bert beta bete bett brab brae brat brea breb bree brer bret brrr btaa btrt bttb eaba eara earb eare eart eata eate ebba ebbr eber eeea eeee eera eeta eete erat erba erbb erbe ereb erer eret erra erre erta etat etbr etee eter etra etre etta ette raab raat raba rabb rabe raer rara rarb rare rata rate ratt rbbb rbbr rea- reae rear reat reba rebb rebe reeb reet rera rere rert reta rete retr rett rrat rrrr rtee taa- taar taat taba tabb tabe taer tara tarb tare tarr tart tata tatb tate tatr tatt tbar tbrb tbta tear teat teba teer teet ter- tera tere terr teta tete tetr tett traa trab trae trat tre- trea tree tret trra trte trtr ttab ttbb tter tttt