a-a a-z aaa aak aao aar aas aaz aka akk ako akr aks aoa aok aoo aor aos ar- ara ark aro arr ars arz as- asa ask aso asr ass asz az- aza azo azs azz k-z ka- kaa kak kao kar kas kaz kkk kkr kks koa kok koo kor kos koz kra krk kro krr krs ksa ksk kso ksr kss kzo oaa oak oao oar oas oka okk oko okr oks oo- ooa ook ooo oor oos or- ora ork oro orr ors orz os- osa osk oso osr oss oza ozo ozs ozz ra- raa rak rao rar ras raz rkk rko rks rkz roa rok roo ror ros roz rra rrk rrr rrs rsa rsk rso rsr rss rza rzo saa sak sao sar sas saz sk- ska skk sko skr sks soa sok soo sor sos soz sr- sra srk sro srr srs ss- ssa ssk sso ssr sss ssz sza szr zaa zak zao zar zas zaz zka zks zo- zoa zok zoo zor zos zro zrs zsa zsz zzr zzs zzz