a-a aaa aad aao aap aas ad- ada add ado adp ads aoa aod aoo aop aos ap- apa apd apo app aps as- asa asd aso asp ass daa dad dao dap das dda ddd ddo ddp dds doa dod doo dop dos dpa dpd dpo dpp dps dsa dsd dso dsp dss 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 p-p paa pad pao pap pas pda pdd pdo pdp pds poa pod poo pop pos ppa ppd ppo ppp pps ps- psa psd pso psp pss saa sad sao sap sas sda sdd sdo sdp sds soa sod soo sop sos spa spd spo spp sps ss- ssa ssd sso ssp sss