a-ak aaaa aaab aaas aaba aabb aaka aasa aass abaa abab abak abas abb- abba abbb abbs abs- absa abss abza akaa akas akka aksa asaa asab asak asas asba aska asks assa assk asss aza- azab azas azaz azza baaa baak baas baaz baba babb babs bak- baka baks basa bask bass baza bbas bbbb bbbs bsaa bsas bzzz kaaa kaab kaak kaas kaba kabb kabz kaka kakk kaks kas- kasa kasb kask kass kaza kazz kbaa kbab kbak kbas kbaz kbba kbbb kbbk kbbs kbbz kbkb kbkk kbkz kbsa kbsb kbsk kbss kbsz kbzs kbzz kkaa kkba kkbb kkbs kkbz kkkk kksa kkss kkzz ksab ksak ksas ksaz ksba ksbs ksbz kska kskb kskk ksks kskz kssa ksss kssz kzaz kzbb kzbk kzbs kzbz kzks kzkz kzsb kzza kzzb kzzk kzzs kzzz saab saak saas saaz saba sabb sabs sabz saka sakb sakk saks sasa sask sass saza sbaa sbas sbbs sbsa skab skaz skss ssaa ssab ssas sssa sssb ssss szss zaba zaka zakk zaks zask zaza zsss zzzs zzzz