a-ak aaaa aaab aaap aaas aaba aabb aabp aaka aapa aaps aasa aass abaa abab abak abap abas abb- abba abbb abbs abpa abpp abps abs- absa absp abss akaa akap akas akka aksa apak apap apas apba apbs appa apps apsa apss asaa asab asak asap asas asba aska asks aspa asps assa assk assp asss baaa baak baas baba babb babs bak- baka baks bapa bapp baps basa bask bass bbas bbbb bbbs bksp bpsa bsaa bsap bsas bspp kaaa kaab kaak kaap kaas kaba kabb kaka kakk kaks kap- kapa kapp kaps kas- kasa kasb kask kasp kass kbaa kbab kbak kbap kbas kbba kbbb kbbk kbbs kbkb kbkk kbpa kbpk kbps kbsa kbsb kbsk kbss kkaa kkap kkba kkbb kkbs kkkk kkpk kkps kksa kksp kkss kpak kpas kpba kpbb kpbs kpkk kppk kppp kpsp ksab ksak ksas ksba ksbp ksbs kska kskb kskk ksks kspa kspb kspk ksps kssa ksss paak paap paas paba paka paks papa papb papp paps pasa pask pasp pass pbpa pbpk pbsa pbsp ppap pppa pppp ppps ppss psap psas pspp psps pssa saab saak saap saas saba sabb sabs saka sakb sakk saks sapa sapp saps sasa sask sass sbaa sbas sbbs sbsa sbsp skab skap skss sp-a spak spap spas spps spsa spsp spss ssaa ssab ssap ssas sspa ssps sssa sssb ssss