a-a a-z aaa aad aao aap aas aaz ad- ada add ado adp ads adz aoa aod aoo aop aos ap- apa apd apo app aps as- asa asd aso asp ass asz az- aza azd azo azp azs azz daa dad dao dap das daz dda ddd ddo ddp dds ddz doa dod doo dop dos doz dpa dpd dpo dpp dps dpz dsa dsd dso dsp dss dsz dza dzd dzo dzp dzs oaa oad oao oap oas oda odd odo odp ods oo- ooa ood ooo oop oos op- opa opd opo opp ops os- osa osd oso osp oss oza ozo ozs ozz p-p paa pad pao pap pas paz pda pdd pdo pdp pds pdz poa pod poo pop pos poz ppa ppd ppo ppp pps ppz ps- psa psd pso psp pss pzp saa sad sao sap sas saz sda sdd sdo sdp sds sdz soa sod soo sop sos soz spa spd spo spp sps spz ss- ssa ssd sso ssp sss ssz sza szd szp zaa zad zao zap zas zaz zds zo- zoa zod zoo zos zpo zpp zsa zsz zzs zzz