-up a-a a-b a-c aaa aab aac aak aap aas aau ab- aba abb abc abk abp abs abu ac- aca acb acc ack acp acs acu aka akb akc akk akp aks aku ap- apa apb apc apk app aps apu as- asa asb asc ask asp ass asu au- aua aub auc auk aup aus b-p b-u baa bab bac bak bap bas bau bba bbb bbc bbk bbp bbs bbu bca bcb bcc bck bcp bcs bcu bka bkb bkc bkk bkp bks bpa bpb bpc bpp bps bpu bsa bsb bsc bsk bsp bss bsu bua bub buc buk bup bus buu c-- caa cab cac cak cap cas cau cba cbb cbc cbk cbp cbs cbu cca ccb ccc cck ccp ccs ccu cka ckb ckc cks cpa cpb cpc cpk cpp cps cpu csa csb csc csk csp css csu cua cub cuc cuk cup cus cuu ka- kaa kab kac kak kap kas kau kba kbb kbc kbk kbp kbs kbu kca kcb kcc kck kcp kcs kcu kkb kkc kkk kkp kks kku kpa kpc kpk kpp kps kpu ksa ksb ksc ksk ksp kss ksu kub kuc kuk kup kus kuu p-p paa pab pac pak pap pas pau pba pbb pbc pbk pbp pbs pbu pca pcb pcc pck pcp pcs pcu pka pkb pkc pkp pks pku ppa ppb ppc ppk ppp pps ppu ps- psa psb psc psk psp pss psu pua pub puc puk pup pus puu saa sab sac sak sap sas sau sba sbb sbc sbk sbp sbs sbu sca scb scc sck scp scs scu sk- ska skb skc skk skp sks sku spa spb spc spk spp sps spu ss- ssa ssb ssc ssk ssp sss ssu sua sub suc suk sup sus suu ua- uaa uab uac uak uap uas uau uba ubb ubc ubk ubp ubs ubu uca ucb ucc uck ucp ucs ucu uka ukb ukc ukk ukp uku up- upa upb upc upk upp ups upu usa usb usc usk usp uss usu uua uuc uus uuu

a-ak aaaa aaab aaac aaap aaas aaba aabb aabc aabp aaca aacb aacc aack aacp aacs aacu aaka aaku aapa aapc aaps aasa aasc aass aasu aaup aaus abaa abab abac abak abap abas abau abb- abba abbb abbs abca abcb abcc abcp abcs abpa abpc abpp abps abs- absa absp abss absu abua abuk abus acaa acab acac acap acas acba acca accc accp accs accu acks acpa acps acpu acsa acsc acss acu- acup acus akaa akap akas akca akka akku akpu aksa aksu akua apac apak apap apas apba apbs apca apcb apcc apcs appa appc apps appu apsa apss apsu apua apuc apup apus asaa asab asac asak asap asas asau asba asbu asc- asca ascb ascc ascp aska asks aspa aspc asps assa assc assk assp asss assu asub asus auaa auca aucp auks aupc aups ausa ausu baaa baak baas baba babb babs babu bac- baca bacc back bacs bak- baka baks baku bapa bapc bapp baps bapu basa basc bask bass basu bau- bauk bbas bbau bbbb bbbs bcaa bcap bcas bcbc bcbp bcbs bcca bccc bccs bcpp bcps bcsa bcsc bcss bcuc bcup bksp bpcp bpsa bpsu bsaa bsac bsap bsas bscp bscs bspp bssc bsup buba bubb bubs bubu buca bucc buck bucs bucu buka bukk buku bupa bupc bups busa busc busk buss busu buus caaa caab caac caap caas caba cabs cabu cac- caca cacc cack caka capa capb capc capp caps capu casa casb casc cask casp cass casu cauc cauk caup caus cbac cbbc cbbs cbca cbcc cbcp cbcs cbcu cbka cbpc cbpp cbsa cbsc cbus ccaa ccab ccac ccap ccas ccba ccbc ccca cccb cccc cccp cccs cccu ccpa ccpp ccps ccsa ccsp ccss ccuc ccup ccus ckac ckbc ckck ckcs ckpc cksa cksb cpaa cpac cpap cpas cpbc cpca cpcs cpcu cppa cpps cpsa cpsc cpsk cpsu cpus csaa csab csac csak csas cscb cscc cscs cska csks cspa cspb cspc csps cssa csua csup csus cuau cub- cuba cubb cubs cuca cucc cuck cuk- cuka cupp cups cusa cusb cusk cusp cuss cusu kaaa kaab kaak kaap kaas kaba kabb kabc kabu kacb kacc kacp kacs kacu kaka kakc kakk kaks kaku kap- kapa kapc kapp kaps kapu kas- kasa kasb kasc kask kasp kass kasu kau- kaub kauc kauk kaup kaus kbaa kbab kbac kbak kbap kbas kbba kbbb kbbc kbbk kbbs kbbu kbca kbcb kbck kbcs kbcu kbkb kbkk kbpa kbpc kbpk kbps kbpu kbsa kbsb kbsk kbss kbsu kbua kbub kbuc kbuk kbup kbus kbuu kcaa kcab kcac kcap kcas kcau kcba kcbc kcbk kcbs kcbu kcca kccb kccc kcck kccu kckc kckk kcpa kcpc kcps kcpu kcsa kcsb kcsc kcsp kcss kcsu kcua kcub kcuk kcup kkaa kkac kkap kkba kkbb kkbs kkcb kkck kkcs kkkk kkpc kkpk kkps kksa kksp kkss kksu kkua kkup kkus kkuu kpac kpak kpas kpau kpba kpbb kpbs kpcc kpcs kpkk kppc kppk kppp kpsc kpsp kpsu kpua kpub kpus ksab ksac ksak ksas ksau ksba ksbc ksbp ksbs ksca kscb ksck kscs kscu kska kskb kskk ksks ksku kspa kspb kspc kspk ksps kssa ksss kssu ksua ksub ksup ksuu kuac kuap kuau kuba kubb kubc kubs kubu kuca kucb kucc kucp kuka kukk kuks kuku kupa kupb kups kupu kusa kusb kusc kusp kusu kuub kuuk kuuu paak paap paas paba pabu paca pack pacs pacu paka paks paku papa papb papp paps pasa pasc pask pasp pass paua pauk paup paus pbac pbcc pbpa pbpk pbsa pbsp pcaa pcap pcas pcba pcbc pcbs pcca pccc pccs pcks pcpb pcpp pcps pcsa pkcs ppac ppap ppcc ppcs pppa pppp ppps ppss psac psap psas psca pscu pspp psps pssa pssc puas pubs pubu puca puck puka puku pupa pups pupu pusa pusk puss puuc sa-c saab saac saak saap saas saba sabb sabc sabs sabu saca sacc sack sacs sacu saka sakb sakk saks