-er ddd dde ddg ddo ddp ddr dds de- ded dee deg deo dep der des dgd dge dgg dgp dgr dgs dod doe dog doo dop dor dos dpd dpe dpg dpo dpp dpr dps drd dre drg dro drp drr drs dsd dse dsg dso dsp dsr dss ed- edd ede edg edo edp edr eds eed eee eeg eeo eep eer ees egd ege egg ego egp egr egs eo- eod eoe eog eoo eop eor eos ep- epd epe epg epo epp epr eps erd ere erg ero erp err ers es- esd ese esg eso esp esr ess g-d g-p gdd gde gdo gdp gdr gds ge- ged gee geg geo gep ger ges ggd ggg ggo ggp ggr ggs god goe gog goo gop gor gos gpd gpe gpg gpo gpp gpr gps grd gre grg gro grp grr grs gsd gse gsg gso gsp gsr gss odd ode odg odo odp odr ods oed oee oeg oeo oep oer oes ogd oge ogg ogo ogp ogs oo- ood oog ooo oop oor oos op- opd ope opg opo opp opr ops or- ord ore org oro orp orr ors os- osd ose osg oso osp osr oss p-p pdd pde pdg pdo pdp pdr pds ped pee peg peo pep per pes pgd pge pgg pgo pgp pgr pgs pod poe pog poo pop por pos ppd ppe ppg ppo ppp ppr pps prd pre prg pro prp prr prs ps- psd pse psg pso psp psr pss rdd rde rdg rdo rdp rdr rds re- red ree reg reo rep rer res rgd rge rgg rgo rgp rgr rgs rod roe rog roo rop ror ros rpd rpe rpg rpo rpp rpr rps rrd rrg rrp rrr rrs rsd rse rsg rso rsp rsr rss sdd sde sdg sdo sdp sdr sds se- sed see seg seo sep ser ses sgd sge sgg sgo sgp sgr sgs sod soe sog soo sop sor sos spd spe spg spo spp spr sps sr- srd sre srg sro srp srr srs ss- ssd sse ssg sso ssp ssr sss