-er a-a a-b a-t aaa aab aae aar aat aax ab- aba abb abe abr abt abx aea aeb aee aer aet aex ar- ara arb are arr art arx at- ata atb ate atr att atx ax- axa axe axr axt axx baa bab bae bar bat bax bba bbb bbe bbr bbt bbx be- bea beb bee ber bet bex bra brb bre brr brt brx bta btb bte btr btt btx bxb bxx eaa eab eae ear eat eax eba ebb ebe ebr ebt ebx eea eeb eee eer eet eex era erb ere err ert eta etb ete etr ett etx ex- exa exe exr ext exx ra- raa rab rae rar rat rax rba rbb rbe rbr rbt rbx re- rea reb ree rer ret rex rra rrb rrr rrt rta rtb rte rtr rtt rtx rxr t-x taa tab tae tar tat tax tba tbb tbe tbr tbt te- tea teb tee ter tet tex tra trb tre trr trt trx tta ttb tte ttr ttt ttx txe txt xaa xar xat xbe xbr xbx xee xer xet xex xrt xrx xtr xtx xxx

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

-aaa- -tree aaaee aaata aabaa aabba aabra aatxe abaab ababa ababe abaer abara abare abate abbar abbat abbet abear abeat abeba abebe abeer abeet abera abere aberr abert abrar abtaa abtar aeaea aebbe aetat aeter ar-ab araat arab- araba arabe araea arara arare arata arate araxa arbab arbar arbat arbee arber arbet arbre areae arear areat areet arere arete arett arexx arrea arret art-x artar artat artax artea arter artex atara ataxx atbar atbat atear ateat ater- aterr atete atrab atrax atree atrex attar attea atter attex attra axert baabe baart baata baate babar babax babee baber babra baert bar-x baraa barab barar barat barba barbe barea barer baret barra barre barta batab batar batat batea bater batra batre batta batte bbart bbbee bbear be-er beara beare beart beata beate bebar bebat beber bebra beebe beete berar berat berba berbe berea beret berra berre berta berte betar betax betee beter betra betre bett- betta bette bexar bexta braat brate bratt bre-x breba breer breet brera brere brett bretx brrar brrrr btr-t earar eatat eater eatre ebara ebart ebate ebber ebbet ebert eeeee erate erbaa erbar erbbe erber erear erere errat ertar erte erter etate etete etext etree etter exata exeat exera exert extat exter extra extre ra-ra raaba raabe rabab rabat rabba rabbe rabet rabta rarae rareb raree rarer ratba rateb rater ratra ratta ratte raxar rear- reata reate rebab rebar rebat rebbe reber rebet rebra reere rere- reree reret retab retar retax retee reter retex retta rette rexea rexer rtext rxart t-ara t-bar t-rex ta-ra ta-ta taart tabae tabar tabat taber tabet tabra tabre tarar tarat tarax taree tarer taret tarra tarre tarta tarte tartt tataa tatar tatee tater tatra tatre tatta taxee taxer tbtbt teaba teaer tear- teara teare teart tebar tebat teber tebet tera- terat teret terex terra terre tert- tetar tetea teter tetex tetr- tetra tette texta texte traba traer trata trate tratt traxx treat treba treer treet trere treta trete trett ttttt x-bar xarre xatar xatax xbxrx xebat xebra xerta xerte xetex xetra xexex xrate xtext xtree xxtea

aaaaba abaera abaete abarat abarta abatar abatee abater abatte abbate abbett abeere aberra abrera aerate aertex aetate ararat aratta araxxe arbaer arbra areare areata areeta arette arraba arrear arrere arrete artaxa artere arteta at-bat ataaba atabae atarax atarba atarra atbara atbear ateret aterre atrata atrate atrear atreat atreet atrete attaea attaxe attere atterr attert axetre axtree b-tree baabaa baabar baatar bababe babare babbar babeta baraat barara barata barbae barbar barbat barbee barber barbet barbra barbre barera bareta barete barrat barrax barrea barrer barret bartab barter bartra batara batata batete batter bbbbbb bbbeat bearer beatae beatat beatee beater beebea beebee beerta beeter beraba berare berate berbar berbee berber bereet berere bereta berrer berret bertat bertea bertre betaab betear betere beteta betete bettee better bexter bratte breare breere bretea brette e-rate e-text e-trax eartab ebbert eebree erarta erbare erbree errare errata errate errea errett etaeta etarre exarta exeter extra- r-tree ra-tet raabta rababa rabate rabbat rabbet rabett ratare ratata ratbat ratret rattar rattat ratter re-bar rearea rearer reatta rebata rebate rebear rebeat rerate retear reteer reteet retere retree retret retter t-babe t-barb t-tree taarab taarte