a-be aaaa aaab aaad aaae aaaf aaar aaba aabb aabd aabt aada aade aadt aaea aafa aafb aafd aaff aara aard aare aart aata aatf aatt abaa abab abad abae abaf abar abat abb- abba abbb abbe abbr abbt abda abed abee aber abet abff abra abta adaa adab adad adae adar adat adba adda addd adde addr adea adeb adee ader adet adfa adra adre adta aeaf aede aedt aeer aer- aera aerd aeta aetf aetr aett afaa afad afar afat afdb afee afer afet affa afft afr- afra afre afta afte arab arad arae araf arar arat arba arbe arda arde ardf area ared aree aref aret arfa arfb arff arft arr- arra arre arrr arrt arta arte artr at-t ataa atab atad atae atar atat atdt atea ated atee atef ater atfb atfe atra atre atta atte attr baaa baad baaf baar baat baba babb babe babr bada badb badd bade badr baed baer baff baft bar- bara barb bard bare barf barr bart bata bate batf batt bbad bbbb bbdd bbeb bbet bd-r bead beaf bear beat beba bebb bebe beda bede beeb beed beef beer beet befa befe beff beft bera berd bere berr bert beta bete bett bfta bftt brab brad brae braf brat brda brdt brea breb bred bree bref brer bret brrr btaa btaf btdt btrt bttb daab daad daae daar daba dabb dabt dada dade daeb daer dafa dafe daff daft dara darb dard dare darf darr dart data date datr datt dbar dbtt dddd ddre dead deae deaf dear deba debe debt deda dedd dede deeb deed deef deer deet defe deff deft der- dera derb dere derf derr deta dete detr dfaf dfdt dfer dffa dfrf dftr draa drab drad draf drar drat drba drda drea dred dree dref dret drra dtaa dted eaaf eaba eada eadb eadd eafb eara earb eard eare eart eata eate ebba ebbr ebed eber edad edar edda edde ede- edea eder edfa edra edta eede eeea eeee eefa eefe eera eeta eete efab efbr efda efet effa eft- efta erad eraf erat erba erbb erbe erda erde erdf ereb ered erer eret erft erra erre erta etat etbr etee eter etfa etfb etfe etra etre etta ette faaa faad faba fabd fabe fada fadd fade faeb fafa fafe faff fara farb fard fare farr fart fata fate fatf fatt fbar fead feaf fear feat feba feda fede feeb feed feer feet fefe feff fera ferb ferd fere ferr fert feta fete fetr fett ffar ffee ffff ffrr fftf frab frad frae frat frea fred free fret frta ftea fter raab raad raaf raat raba rabb rabe rada radd rade radr radt raed raef raer rafa rafe raff raft rara rarb rare rarf rata rate ratf ratt rbaf rbbb rbbr rder rdfa rea- read reae reaf rear reat reba rebb rebe reda redd rede redr reeb reed reef reet refd refe reff refr reft rera rerd rere rert reta retd rete retr rett rfae rfef rrad rrat rred rrrr rtbf rtdt rtee rtfb taa- taaf taar taat taba tabb tabe tada tade taer tafa tafe taff taft tara tarb tard tare tarf tarr tart tata tatb tate tatr tatt tbaf tbar tbrb tbta tddb tdff tdra tead tear teat teba teda tedd tede teed teef teer teet teff teft ter- tera tere terf terr teta tete tetr tett tfae tfeb traa trab trad trae traf trat tre- trea tred tree tref tret trfd trfr trra trte trtr ttab ttbb tter ttfa ttff tttt