a-ak a-be aaaa aaab aaac aaae aaap aaba aabb aabc aabp aaca aacb aacc aace aack aacp aaea aaec aaep aaka aake aapa aapc abaa abab abac abae abak abap abb- abba abbb abbe abca abcb abcc abcp abec abee abpa abpc abpp acaa acab acac acae acap acba acca accc acce accp ace- acea acec acek acke acpa acpe aeac aeap aecb aeka akaa akae akap akca akee akka apac apak apap apba apca apcb apcc apea apec apep apke appa appc baaa baak baba babb babe bac- baca bacc bace back baek bak- baka bake bapa bapc bape bapp bbbb bbeb bcaa bcap bcbc bcbp bcca bccc bcec bcpp beak beap beba bebb bebe beca beck beeb beek beep beka beke bpcp bpea caaa caab caac caap caba cabe cac- caca cacc cace cack caec caka cake capa capb capc cape capp cbac cbbc cbca cbcc cbce cbcp cbea cbec cbee cbka cbpc cbpp ccaa ccab ccac ccap ccba ccbc ccca cccb cccc cccp ccee ccpa ccpe ccpp ceac ceba cebp cec- ceca cece cecp ceeb ceec ceke cepa cepc cepe cepp ckac ckbc ckbe ckck ckpc cpaa cpac cpap cpbc cpca cpce cpea cpeb cpep cppa eaba eaca eacc eaec eapc eapp ebac ebba ebbc ebcc ecaa ecac ecbc ecbe ecca eccb eccc ecce ecka ecpa ecpp eeca eeea eeee eeka eeke eka- ekab ekeb ekek ekka ekpe epaa epac epcc epec epee eppa eppc eppp kaaa kaab kaak kaap kaba kabb kabc kabe kacb kacc kace kacp kaep kaka kakc kake kakk kap- kapa kapc kape kapp kbaa kbab kbac kbae kbak kbap kbba kbbb kbbc kbbe kbbk kbca kbcb kbce kbck kbeb kbec kbee kbek kbkb kbkk kbpa kbpc kbpe kbpk kcaa kcab kcac kcap kcba kcbc kcbk kcca kccb kccc kcck kcea kceb kcec kcee kcep kckc kckk kcpa kcpc kea- keak keap keba kebb kebc kebe keca keck keek keep keka kekb kekc keke kep- kepa kepc kepe kkaa kkac kkap kkba kkbb kkbe kkcb kkck kkea kkkk kkpc kkpk kpac kpae kpak kpba kpbb kpbe kpcc kpek kpke kpkk kppc kppk kppp paak paap paba paca pace pack paea paec paep paka pake papa papb pape papp pbac pbcc pbpa pbpk pcaa pcae pcap pcba pcbc pcca pccc pcce pcea pcep pcpb pcpp peab peac peak peap peba peca pece peck peec peek peep peka peke pekk pepa pepe ppac ppap ppcc pppa pppp