a-be aaaa aaab aaac aaae aaap aaar aaba aabb aabc aabp aabt aaca aacb aacc aace aacp aacr aact aaea aaec aaep aapa aapc aapt aara aarc aare aarp aart aata aatc aatt abaa abab abac abae abap abar abat abb- abba abbb abbe abbr abbt abca abcb abcc abcp abcr abct abec abee aber abet abpa abpc abpp abpr abra abrc abta ac-t acaa acab acac acae acap acar acat acba acca accc acce accp acct ace- acea acec acer acet acpa acpe acpr acpt acr- acra acrc acre acrr acta actc acte actt aeac aeap aecb aect aeer aer- aera aerc aeta aetc aetr aett apac apap apar apat apba apbr apca apcb apcc apcr apea apec apep aper apet appa appc appr appt apra aprc apre aprt apta aptc apte aptt arab arac arae arap arar arat arba arbe arc- arca arce arct area arec aree arep aret arpa arpe arr- arra arrc arre arrr arrt arta artc arte artr at-t ataa atab atac atae atap atar atat atca atcc atcr atea atec atee atep ater atpr atra atrc atre atrp atta atte attp attr baaa baar baat baba babb babe babr bac- baca bacc bace bact baer bapa bapc bape bapp bapt bar- bara barb barc bare barr bart bata batc bate batt bbbb bbeb bbet bbpr bbrc bcaa bcap bcar bcat bcbc bcbp bcca bccc bcec bcer bcet bcpp bcra bctc beap bear beat beba bebb bebe beca beeb beep beer beet bera berc bere berr bert beta betc bete bett bpcp bpea bprc brab brac brae brat brca brcb brce brea breb brec bree brep brer bret brrr brtc btaa btbp btcc btec btrc btrt bttb caaa caab caac caap caat caba cabe cac- caca cacc cace cacr caec caer capa capb capc cape capp capt cara carb carc care carp carr cart cat- cata catb catc cate catt cbac cbar cbat cbbc cbca cbcc cbce cbcp cbcr cbct cbea cbec cbee cber cbet cbpc cbpp cbre cbrt cbta cbtc ccaa ccab ccac ccap ccar ccat ccba ccbc ccca cccb cccc cccp ccee ccpa ccpe ccpp ccpr ccra ccrc ccre ccrp ccrt cctb cctc cctt ceac cear ceat ceba cebp cec- ceca cece cecp cect ceeb ceec cepa cepc cepe cepp cepr cept cer- cera cerc cere cerp cert cet- ceta cete cetp cpaa cpac cpap cpbc cpca cpce cpea cpeb cpep cper cppa cpre cprt cptp cptr crab crac crap crar crat crbc crca crcc crce crcr cre- crea creb crec cree crep cret crpc crrt crtc crtp ctab ctae ctba ctca ctcp ctec ctep ctpp ctrc ctrp ctta eaba eaca eacc eaec eapc eapp eara earb eare earp eart eata eate ebac ebba ebbc ebbr ebcc eber ecaa ecac ecar ecat ecbc ecbe ecca eccb eccc ecce ecct ecpa ecpp ecra ecrc ecrr ect- ecta ectc eeca eeea eeee eera eerc eeta eetc eete epaa epac epcc epec epee eper eppa eppc eppp epra eprb eprp epta epte erap erat erba erbb erbe erca ercc erce ercp ereb erec erer eret erpa erpe erra errc erre erta etap etat etbc etbr etcc etec etee eter etra etre etta ette paap paar paat paba pabt paca pace pact paea paec paep paer papa papb pape papp papr par- para parc pare parp parr part pata pate patr patt pbac pbar pbcc pbpa pcaa pcae pcap pcba pcbc pcca pccc pcce pcea pcep pcer pcpb pcpp pcra pcrc pcre pcte peab peac peap pear peat peba peca pece pecr pect peec peep peer peet pepa pepe per- pera perc pere perp perr pert peta pete petr pett ppac ppap ppar ppcc pper pppa pppp pprc ppta pptt prae prar prat prbc prca prcc prcp pre- preb prec pree prep pret prtc prtp prtr ptab ptca ptcc pter pttc raab raat raba rabb rabe rac- raca racc race ract raec raep raer rapa rapc rape rapp rapt rara rarb rare rata rate ratp ratt rbbb rbbr rcac rcbc rccb rccc rcep rcet rcpt rctc rea- reac reae reap rear reat reba rebb rebe reca recc rece recp recr rect reeb reep reet repe repp repr rept rera rere rert reta rete retr rett rpca rpet rpta rrat rrrr rtca rtcc rtce rtee rtpa rttp taa- taar taat taba tabb tabc tabe taca tacc tace tact taec taer tapa tape tapp tapr tapt tara tarb tarc tare tarp tarr tart tata tatb tate tatr tatt tbar tbca tbcb tbcc tbce tbrb tbta tbtp tcap tcca tccc tcep tcpa tctc teac tear teat teba teca tecr tect teec teer teet tepa tepe tepp ter- tera terc tere terp terr teta tete tetr tett tpac tpap tpcp tper tppa tppp tppr tpte tptp tptr traa trab trac trae trap trat trca trcc tre- trea trec tree tret trpa trpc trpe trpp trra trtc trte trtr ttab ttbb ttcp tter tttt