a-be aaaa aaab aaac aaae aaap aaba aabb aabc aabp aaca aacb aacc aace aaco aacp aaea aaec aaep aaoe aaoo aapa aapc aapo abaa abab abac abae abap abb- abba abbb abbe abbo abca abcb abcc abcp abec abee aboa abob aboo abpa abpc abpp acaa acab acac acae acap acba acca accc acce acco accp ace- acea acec acoa acoe acop acpa acpe aeac aeap aecb aoba aoca aoce aopo apac apao apap apba apca apcb apcc apco apea apec apep apo- apoc apoe apoo apop appa appc baaa baba babb babe babo bac- baca bacc bace baco bapa bapc bape bapp bbbb bbeb bcaa bcap bcbc bcbp bcca bccc bcec bcpp beap beba bebb bebe bebo beca beeb beep beo- bepo boab boac boba bobb bobe bobo boca boce boco boea boec boee boeo boep boob booc booe boop bopa bope bopp bpcp bpea bpoe c-bo caaa caab caac caap caba cabe cabo cac- caca cacc cace caco caec capa capb capc cape capo capp cbac cbbc cbca cbcc cbce cbcp cbea cbec cbee cbpc cbpp ccaa ccab ccac ccap ccba ccbc ccca cccb cccc cccp ccee ccob ccoc ccpa ccpe ccpp ceac ceba cebp cec- ceca cece ceco cecp ceeb ceec ceop cepa cepc cepe cepo cepp coba cobb cobe cobo coca coce coco cocp coep coob coop copa cope copo copp cpaa cpac cpap cpbc cpca cpce cpea cpeb cpep cppa eaba eaca eacc eaec eaop eapc eapp ebac ebba ebbc ebbo ebcc eboe eboo ebpo ecaa ecac ecao ecbc ecbe ecca eccb eccc ecce ecco eco- ecop ecpa ecpp eeca eeea eeee eeoc epaa epac epcc epec epee epoc eppa eppc eppo eppp o-eo obba obbo obea obec oboe ocab ocac ocap ocbc occa occc oce ocee ocpa ocpp oec- oeca oecc oeec oepa ooaa ooba oobe oooo opap opca opec opep opo- oppa oppo paap paba paca pace paco paea paec paep paoc papa papb pape papp pbac pbcc pboc pbpa pcaa pcae pcap pcba pcbc pcca pccc pcce pcea pcep pcoa pcoe pcpb pcpp peab peac peap peba peca pece peco peec peep pepa pepe pepo poba pobo poca poce poco poea poop pop- popa popc pope popo popp ppac ppap ppcc ppoa pppa pppo pppp