a-a a-c a-z aaa aac aak aao aas aaz ac- aca acc ack aco acs acz aka akc akk ako aks aoa aoc aok aoo aos as- asa asc ask aso ass asz az- aza azo azs azz c-- caa cac cak cao cas caz cca ccc cck cco ccs ccz cka ckc cko cks co- coa coc cok coo cos coz csa csc csk cso css csz cz- czc czk czo k-z ka- kaa kac kak kao kas kaz kca kcc kck kcs kkc kkk kks koa koc kok koo kos koz ksa ksc ksk kso kss kzo oaa oac oak oao oas oc- oca occ ock oco ocs ocz oka okc okk oko oks oo- ooa ooc ook ooo oos os- osa osc osk oso oss oza ozo ozs ozz saa sac sak sao sas saz sca scc sck sco scs sk- ska skc skk sko sks soa soc sok soo sos soz ss- ssa ssc ssk sso sss ssz sza zaa zac zak zao zas zaz zco zcs zka zks zo- zoa zoc zok zoo zos zsa zsz zzs zzz