a-ak a-be aaaa aaab aaac aaae aaap aaar aaba aabb aabc aabp aaca aacb aacc aace aack aacp aacr aaea aaec aaep aaka aake aapa aapc aara aarc aare aarp abaa abab abac abae abak abap abar abb- abba abbb abbe abbr abca abcb abcc abcp abcr abec abee aber abpa abpc abpp abpr abra abrc acaa acab acac acae acap acar acba acca accc acce accp ace- acea acec acek acer acke acpa acpe acpr acr- acra acrc acre acrr aeac aeap aecb aeer aeka aer- aera aerc akaa akae akap akar akca akee aker akka akr- akra akre apac apak apap apar apba apbr apca apcb apcc apcr apea apec apep aper apke appa appc appr apra aprc apre arab arac arae arak arap arar arba arbe arc- arca arce area arec aree arek arep arka arke arpa arpe arr- arra arrc arre arrk arrr baaa baak baar baba babb babe babr bac- baca bacc bace back baek baer bak- baka bake bakr bapa bapc bape bapp bar- bara barb barc bare bark barr bbbb bbeb bbpr bbrc bcaa bcap bcar bcbc bcbp bcca bccc bcec bcer bcpp bcra beak beap bear beba bebb bebe beca beck beeb beek beep beer beka beke bera berc bere berk berr bkpr bpcp bpea bprc brab brac brae brak brca brcb brce brea breb brec bree brek brep brer brka brkb brrr caaa caab caac caap caba cabe cac- caca cacc cace cack cacr caec caer caka cake capa capb capc cape capp cara carb carc care cark carp carr cbac cbar cbbc cbca cbcc cbce cbcp cbcr cbea cbec cbee cber cbka cbkr cbpc cbpp cbre ccaa ccab ccac ccap ccar ccba ccbc ccca cccb cccc cccp ccee ccpa ccpe ccpp ccpr ccra ccrc ccre ccrp ceac cear ceba cebp cec- ceca cece cecp ceeb ceec ceke cepa cepc cepe cepp cepr cer- cera cerc cere cerp ckac ckbc ckbe ckck cker ckpc ckpr ckrc cpaa cpac cpap cpbc cpca cpce cpea cpeb cpep cper cppa cpre crab crac crap crar crbc crca crcc crce crcr cre- crea creb crec cree crep crkc crkp crpc eaba eaca eacc eaec eapc eapp eara earb eare earp ebac ebba ebbc ebbr ebcc eber ecaa ecac ecar ecbc ecbe ecca eccb eccc ecce ecka ecpa ecpp ecra ecrc ecrr eeca eeea eeee eeka eeke eera eerc eka- ekab ekeb ekek eker ekka ekpe epaa epac epcc epec epee eper eppa eppc eppp epra eprb eprp erap erba erbb erbe erca ercc erce ercp ereb erec erer erke erpa erpe erra errc erre kaaa kaab kaak kaap kaar kaba kabb kabc kabe kabr kacb kacc kace kacp kaep kaer kaka kakc kake kakk kap- kapa kapc kape kapp kara karb kare kark karp karr kbaa kbab kbac kbae kbak kbap kbar kbba kbbb kbbc kbbe kbbk kbbr kbca kbcb kbce kbck kbcr kbeb kbec kbee kbek kber kbkb kbkk kbkr kbpa kbpc kbpe kbpk kbpr kbra kbrb kbrc kbre kbrk kcaa kcab kcac kcap kcar kcba kcbc kcbk kcbr kcca kccb kccc kcck kccr kcea kceb kcec kcee kcep kckc kckk kckr kcpa kcpc kcpr kcrc kcrp kcrr kea- keak keap kear keba kebb kebc kebe kebr keca keck kecr keek keep keer keka kekb kekc keke kep- kepa kepc kepe ker- kera kerb kerc kere kerk kerp kerr kkaa kkac kkap kkar kkba kkbb kkbe kkbr kkcb kkck kkcr kkea kkkk kkpc kkpk kkrb kkrc kkre kkrk kkrr kpac kpae kpak kpar kpba kpbb kpbe kpbr kpcc kpcr kpek kper kpke kpkk kpkr kppc kppk kppp kppr kprb kprc kpre kprk kprp kprr krab krac krae krak krap krar krba krbb krbe krbk krbr krca krcb krcc krce krea kreb krec kree krek krka krkc krke krkk krkr krpa krpr krrb krrc krre krrk krrr paak paap paar paba paca pace pack paea paec paep paer paka pake papa papb pape papp papr par- para parc pare park parp parr pbac pbar pbcc pbpa pbpk pcaa pcae pcap pcba pcbc pcca pccc pcce pcea pcep pcer pcpb pcpp pcra pcrc pcre peab peac peak peap pear peba peca pece peck pecr peec peek peep peer peka peke pekk pepa pepe per- pera perc pere perk perp perr ppac ppap ppar ppcc pper pppa pppp pprc prae prar prbc prca prcc prcp pre- preb prec pree prek prep raab raak raba rabb rabe rabk rac- raca racc race rack raec raep raer raka rake rakk rapa rapc rape rapp rara rarb rare rark rbbb rbbr rcac rcbc rccb rccc rcep rea- reac reae reak reap rear reba rebb rebe rebk reca recc rece reck recp recr reeb reek reep reka reke repe repp repr rera rere rpca rrrr