a-a a-z aaa aad aak aao aap aaz ad- ada add adk ado adp adz aka akd akk ako akp aoa aod aok aoo aop ap- apa apd apk apo app az- aza azd azo azp azz daa dad dak dao dap daz dda ddd ddk ddo ddp ddz dka dkk dko dkp doa dod dok doo dop doz dpa dpd dpk dpo dpp dpz dza dzd dzo dzp k-z ka- kaa kad kak kao kap kaz kda kdk kdo kdp kkk kkp koa kod kok koo kop koz kpa kpd kpk kpo kpp kzo oaa oad oak oao oap oda odd odo odp oka okd okk oko okp oo- ooa ood ook ooo oop op- opa opd opk opo opp oza ozo ozz p-p paa pad pak pao pap paz pda pdd pdk pdo pdp pdz pka pkd pko pkp poa pod pok poo pop poz ppa ppd ppk ppo ppp ppz pzk pzp zaa zad zak zao zap zaz zka zo- zoa zod zok zoo zpo zpp zzz