a-a a-c a-z aaa aac aak aao aap aaz ac- aca acc ack aco acp acz aka akc akk ako akp aoa aoc aok aoo aop ap- apa apc apk apo app az- aza azo azp azz c-- caa cac cak cao cap caz cca ccc cck cco ccp ccz cka ckc cko co- coa coc cok coo cop coz cpa cpc cpk cpo cpp cpz cz- czc czk czo k-z ka- kaa kac kak kao kap kaz kca kcc kck kcp kkc kkk kkp koa koc kok koo kop koz kpa kpc kpk kpo kpp kzo oaa oac oak oao oap oc- oca occ ock oco ocp ocz oka okc okk oko okp oo- ooa ooc ook ooo oop op- opa opc opk opo opp oza ozo ozz p-p paa pac pak pao pap paz pca pcc pck pco pcp pka pkc pko pkp poa poc pok poo pop poz ppa ppc ppk ppo ppp ppz pzc pzk pzp zaa zac zak zao zap zaz zco zka zo- zoa zoc zok zoo zpc zpo zpp zzz