a-a aaa aad aao aap aar aas ad- ada add ado adp adr ads aoa aod aoo aop aor aos ap- apa apd apo app apr aps ar- ara ard aro arp arr ars as- asa asd aso asp asr ass daa dad dao dap dar das dda ddd ddo ddp ddr dds doa dod doo dop dor dos dpa dpd dpo dpp dpr dps dra drd dro drp drr drs dsa dsd dso dsp dsr dss oaa oad oao oap oar oas oda odd odo odp odr ods oo- ooa ood ooo oop oor oos op- opa opd opo opp opr ops or- ora ord oro orp orr ors os- osa osd oso osp osr oss p-p paa pad pao pap par pas pda pdd pdo pdp pdr pds poa pod poo pop por pos ppa ppd ppo ppp ppr pps pra prd pro prp prr prs ps- psa psd pso psp psr pss ra- raa rad rao rap rar ras rda rdd rdo rdp rdr rds roa rod roo rop ror ros rpa rpd rpo rpp rpr rps rra rrd rrp rrr rrs rsa rsd rso rsp rsr rss saa sad sao sap sar sas sda sdd sdo sdp sdr sds soa sod soo sop sor sos spa spd spo spp spr sps sr- sra srd sro srp srr srs ss- ssa ssd sso ssp ssr sss