a-ak aaaa aaab aaap aaar aaas aaba aabb aabp aaka aapa aaps aara aarp aars aasa aass abaa abab abak abap abar abas abb- abba abbb abbr abbs abpa abpp abpr abps abra abrs abs- absa absp abss akaa akap akar akas akka akr- akra aksa apak apap apar apas apba apbr apbs appa appr apps apra aprs apsa apss arab arak arap arar aras arba arbs arka arks arpa arps arr- arra arrk arrr arrs ars- arsa arsk asaa asab asak asap asar asas asba aska askr asks aspa aspr asps asra asrs assa assk assp assr asss baaa baak baar baas baba babb babr babs bak- baka bakr baks bapa bapp baps bar- bara barb bark barr bars basa bask bass bbas bbbb bbbs bbpr bkpr bksp bpsa brab brak bras brka brkb brrr brrs brsb brsr bsaa bsap bsas bspp bspr bsra kaaa kaab kaak kaap kaar kaas kaba kabb kabr kaka kakk kaks kap- kapa kapp kaps kara karb kark karp karr kars kas- kasa kasb kask kasp kasr kass kbaa kbab kbak kbap kbar kbas kbba kbbb kbbk kbbr kbbs kbkb kbkk kbkr kbpa kbpk kbpr kbps kbra kbrb kbrk kbsa kbsb kbsk kbsr kbss kkaa kkap kkar kkba kkbb kkbr kkbs kkkk kkpk kkps kkrb kkrk kkrr kkrs kksa kksp kksr kkss kpak kpar kpas kpba kpbb kpbr kpbs kpkk kpkr kppk kppp kppr kprb kprk kprp kprr kprs kpsp krab krak krap krar kras krba krbb krbk krbr krka krkk krkr krks krpa krpr krps krrb krrk krrr krrs krsa krsk krsr krss ksab ksak ksar ksas ksba ksbp ksbr ksbs kska kskb kskk kskr ksks kspa kspb kspk kspr ksps ksra ksrb ksrp ksrr ksrs kssa kssr ksss paak paap paar paas paba paka paks papa papb papp papr paps par- para park parp parr pars pasa pask pasp pass pbar pbpa pbpk pbrs pbsa pbsp ppap ppar pppa pppp ppps ppss prar pras prbs prps prrs prsa prss psap psas psbr pspp pspr psps psrk psrp pssa raab raak raas raba rabb rabk rabs raka rakk rapa rapp raps rara rarb rark rars rasa rask rasp rass rbbb rbbr rbbs rbsp rbss rkss rpps rras rrrr rrsp rsaa rspb rspk rsps rssa saab saak saap saar saas saba sabb sabr sabs saka sakb sakk saks sapa sapp saps sara sark sarp sarr sars sasa sask sass sbaa sbar sbas sbbs sbrk sbsa sbsp skab skap skar skra skss sp-a spak spap spar spas spkr spps sprs spsa spsp spss sras srps srsp ssaa ssab ssap ssas ssbr sspa ssps ssra ssrs sssa sssb ssss