a-ak aaaa aaab aaac aaap aaba aabb aabc aabp aaca aacb aacc aack aacp aacu aaka aaku aapa aapc aaup abaa abab abac abak abap abau abb- abba abbb abca abcb abcc abcp abpa abpc abpp abua abuk acaa acab acac acap acba acca accc accp accu acpa acpu acu- acup akaa akap akca akka akku akpu akua apac apak apap apba apca apcb apcc appa appc appu apua apuc apup auaa auca aucp aupc baaa baak baba babb babu bac- baca bacc back bak- baka baku bapa bapc bapp bapu bau- bauk bbau bbbb bcaa bcap bcbc bcbp bcca bccc bcpp bcuc bcup bpcp buba bubb bubu buca bucc buck bucu buka bukk buku bupa bupc caaa caab caac caap caba cabu cac- caca cacc cack caka capa capb capc capp capu cauc cauk caup cbac cbbc cbca cbcc cbcp cbcu cbka cbpc cbpp ccaa ccab ccac ccap ccba ccbc ccca cccb cccc cccp cccu ccpa ccpp ccuc ccup ckac ckbc ckck ckpc cpaa cpac cpap cpbc cpca cpcu cppa cuau cub- cuba cubb cuca cucc cuck cuk- cuka cupp kaaa kaab kaak kaap kaba kabb kabc kabu kacb kacc kacp kacu kaka kakc kakk kaku kap- kapa kapc kapp kapu kau- kaub kauc kauk kaup kbaa kbab kbac kbak kbap kbba kbbb kbbc kbbk kbbu kbca kbcb kbck kbcu kbkb kbkk kbpa kbpc kbpk kbpu kbua kbub kbuc kbuk kbup kbuu kcaa kcab kcac kcap kcau kcba kcbc kcbk kcbu kcca kccb kccc kcck kccu kckc kckk kcpa kcpc kcpu kcua kcub kcuk kcup kkaa kkac kkap kkba kkbb kkcb kkck kkkk kkpc kkpk kkua kkup kkuu kpac kpak kpau kpba kpbb kpcc kpkk kppc kppk kppp kpua kpub kuac kuap kuau kuba kubb kubc kubu kuca kucb kucc kucp kuka kukk kuku kupa kupb kupu kuub kuuk kuuu paak paap paba pabu paca pack pacu paka paku papa papb papp paua pauk paup pbac pbcc pbpa pbpk pcaa pcap pcba pcbc pcca pccc pcpb pcpp ppac ppap ppcc pppa pppp pubu puca puck puka puku pupa pupu puuc uabc uaca uaua ubac ubba ubpc ucak ucbc ucca uccp ucka ucpa ucpb ucua ukba ukcc ukpa ukup upac upca uppa uppc uppp uppu upup uucp uuuu