-er a-a a-b a-c a-t aaa aab aac aae aar aat aax ab- aba abb abc abe abr abt abx ac- aca acb acc ace acr act acx aea aeb aec aee aer aet aex ar- ara arb arc are arr art arx at- ata atb atc ate atr att atx ax- axa axe axr axt axx baa bab bac bae bar bat bax bba bbb bbc bbe bbr bbt bbx bca bcb bcc bce bcr bct bcx be- bea beb bec bee ber bet bex bra brb bre brr brt brx bta btb btc bte btr btt btx bxb bxx c-- caa cab cac cae car cat cax cba cbb cbc cbe cbr cbt cbx cca ccb ccc cce ccr cct ccx ce- cea ceb cec cee cer cet cex cra crb crc cre crr crt crx cta ctb ctc cte ctr ctt ctx cxc cxr cxt cxx eaa eab eac eae ear eat eax eba ebb ebc ebe ebr ebt ebx ec- eca ecb ecc ece ecr ect ecx eea eeb eec eee eer eet eex era erb erc ere err ert eta etb etc ete etr ett etx ex- exa exc exe exr ext exx ra- raa rab rac rae rar rat rax rba rbb rbc rbe rbr rbt rbx rca rcb rcc rce rcr rct rcx re- rea reb rec ree rer ret rex rra rrb rrc rrr rrt rta rtb rtc rte rtr rtt rtx rxr t-x taa tab tac tae tar tat tax tba tbb tbc tbe tbr tbt tca tcb tcc tce tcr tct tcx te- tea teb tec tee ter tet tex tra trb trc tre trr trt trx tta ttb ttc tte ttr ttt ttx txe txt xaa xac xar xat xbc xbe xbr xbx xcb xcr xcx xee xer xet xex xrc xrt xrx xtc xtr xtx xxx

a-be aaaa aaab aaac aaae aaar aaba aabb aabc aabt aaca aacb aacc aace aacr aact aaea aaec aara aarc aare aart aata aatc aatt abaa abab abac abae abar abat abax abb- abba abbb abbe abbr abbt abca abcb abcc abcr abct abec abee aber abet abra abrc abta ac-t acaa acab acac acae acar acat acba acca accc acce acct ace- acea acec acer acet acr- acra acrc acre acrr acta actc acte actt aeac aecb aect aeer aer- aera aerc aeta aetc aetr aett aetx arab arac arae arar arat arax arba arbe arc- arca arce arct area arec aree aret arex arr- arra arrc arre arrr arrt arta artc arte artr artx at-t at-x ataa atab atac atae atar atat atax atca atcc atcr atea atec atee ater atex atra atrc atre atrx atta atte attr axar axat axce axer ba-x baaa baar baat baba babb babe babr bac- baca bacc bace bact baer bar- bara barb barc bare barr bart barx bata batc bate batt baxt bbbb bbeb bbet bbrc bcaa bcar bcat bcbc bcca bccc bcec bcer bcet bcra bctc bear beat beba bebb bebe beca beeb beer beet bera berc bere berr bert beta betc bete bett brab brac brae brat brax brca brcb brce brea breb brec bree brer bret brex brrr brtc btaa btcc btcx btec btex btrc btrt bttb caaa caab caac caat caba cabe cac- caca cacc cace cacr caec caer caex cara carb carc care carr cart carx cat- cata catb catc cate catt caxa cbac cbar cbat cbax cbbc cbca cbcc cbce cbcr cbct cbea cbec cbee cber cbet cbre cbrt cbta cbtc cbxa ccaa ccab ccac ccar ccat ccba ccbc ccca cccb cccc ccee ccra ccrc ccre ccrt cctb cctc cctt ceac cear ceat ceba cec- ceca cece cect ceeb ceec cer- cera cerc cere cert cet- ceta cete cexe crab crac crar crat crax crbc crca crcc crce crcr cre- crea creb crec cree cret crex crrt crtc ctab ctae ctba ctca ctec ctrc ctta cxxx eaba eaca eacc eaec eara earb eare eart eata eate ebac ebba ebbc ebbr ebcc eber ecaa ecac ecar ecat ecbc ecbe ecca eccb eccc ecce ecct ecra ecrc ecrr ect- ecta ectc eeca eeea eeee eera eerc eeta eetc eete eext er-x erat erba erbb erbe erca ercc erce ereb erec erer eret erra errc erre erta etat etbc etbr etcc etec etee eter etra etre etta ette exa- exec exer exrx exta exte extr raab raat raba rabb rabe rac- raca racc race ract raec raer rara rarb rare rata rate ratt raxa rbbb rbbr rcac rcbc rccb rccc rcet rctc rea- reac reae rear reat reba rebb rebe reca recc rece recr rect reeb reet rera rere rert reta rete retr rett rexx rrat rrrr rtca rtcc rtce rtee rtex taa- taar taat taba tabb tabc tabe taca tacc tace tact taec taer tara tarb tarc tare tarr tart tata tatb tate tatr tatt tax- taxa taxe taxt tbar tbca tbcb tbcc tbce tbrb tbta tcca tccc tctc teac tear teat teba teca tecr tect teec teer teet ter- tera terc tere terr teta tete tetr tett tetx texa text traa trab trac trae trat trax trca trcc tre- trea trec tree tret trex trra trtc trte trtr ttab ttbb tter tttt txaa txtr xaar xace xact xara xare xate xbar xbee xbra xcat xeer xer- xera xert xexe xtar xtea xtra xxxx

-aaa- -tree aaace aaaee aaarc aaata aabaa aabba aabra aacbc aacte aatxe abaab ababa ababe abaca abaer abara abare abate abbac abbar abbat abbet abccc abear abeat abeba abebe abece abeer abeet abera abere aberr abert abrac abrar abtaa abtar acaca acacb acar- acara acare acate accra aceae acera acerb acet- aceta acrab acrea acree act-r actar acter actra aeaea aebbe aetat aeter ar-ab ara-c araat arab- araba arabe araca arace araea arara arare arata arate araxa arbab arbar arbat arbee arber arbet arbre arcae arcee arct- arcte areae arear areat areca arect areet arere arete arett arexx arrea arret art-x artar artat artax artea artec arter artex atara ataxx atbar atbat atear ateat ateca