a-a a-c a-z aaa aac aak aao aaz ac- aca acc ack aco acz aka akc akk ako aoa aoc aok aoo az- aza azo azz c-- caa cac cak cao caz cca ccc cck cco ccz cka ckc cko co- coa coc cok coo coz cz- czc czk czo k-z ka- kaa kac kak kao kaz kca kcc kck kkc kkk koa koc kok koo koz kzo oaa oac oak oao oc- oca occ ock oco ocz oka okc okk oko oo- ooa ooc ook ooo oza ozo ozz zaa zac zak zao zaz zco zka zo- zoa zoc zok zoo zzz