a-be aaaa aaab aaac aaae aaap aaba aabb aabc aabp aaca aacb aacc aace aacp aaea aaec aaep aapa aapc abaa abab abac abae 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 acpa acpe aeac aeap aecb apac apap apba apca apcb apcc apea apec apep appa appc baaa baba babb babe bac- baca bacc bace bapa bapc bape bapp bbbb bbeb bcaa bcap bcbc bcbp bcca bccc bcec bcpp beap beba bebb bebe beca beeb beep bpcp bpea caaa caab caac caap caba cabe cac- caca cacc cace caec capa capb capc cape capp cbac cbbc cbca cbcc cbce cbcp cbea cbec cbee 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 cepa cepc cepe cepp 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 ecpa ecpp eeca eeea eeee epaa epac epcc epec epee eppa eppc eppp paap paba paca pace paea paec paep papa papb pape papp pbac pbcc pbpa pcaa pcae pcap pcba pcbc pcca pccc pcce pcea pcep pcpb pcpp peab peac peap peba peca pece peec peep pepa pepe ppac ppap ppcc pppa pppp