a-a a-c a-z aaa aac aak aao aar aaz ac- aca acc ack aco acr acz aka akc akk ako akr aoa aoc aok aoo aor ar- ara arc ark aro arr arz az- aza azo azz c-- caa cac cak cao car caz cca ccc cck cco ccr ccz cka ckc cko co- coa coc cok coo cor coz cra crc crk cro crr crz cz- czc czk czo k-z ka- kaa kac kak kao kar kaz kca kcc kck kcr kkc kkk kkr koa koc kok koo kor koz kra krc krk kro krr kzo oaa oac oak oao oar oc- oca occ ock oco ocr ocz oka okc okk oko okr oo- ooa ooc ook ooo oor or- ora orc ork oro orr orz oza ozo ozz ra- raa rac rak rao rar raz rca rcc rco rcr rkc rkk rko rkz roa roc rok roo ror roz rra rrc rrk rrr rza rzo zaa zac zak zao zar zaz zco zka zo- zoa zoc zok zoo zor zro zzr zzz