-er ddd dde ddf ddo ddp ddr dds de- ded dee def deo dep der des dfd dfe dff dfo dfp dfr dfs dod doe dof doo dop dor dos dpd dpe dpf dpo dpp dpr dps drd dre dro drp drr drs dsd dse dsf dso dsp dsr dss ed- edd ede edf edo edp edr eds eed eee eef eeo eep eer ees ef- efd efe eff efo efp efr efs eo- eod eoe eof eoo eop eor eos ep- epd epe epf epo epp epr eps erd ere erf ero erp err ers es- esd ese esf eso esp esr ess fdd fde fdf fdo fdp fdr fds fed fee fef feo fep fer fes ffd ffe fff ffo ffp ffr ffs foe fof foo fop for fos fpd fpe fpo fpp fpr fps frd fre frf fro frp frr frs fsd fse fsf fso fsp fsr fss odd ode odf odo odp odr ods oed oee oef oeo oep oer oes of- ofd ofe off ofo ofp ofr ofs oo- ood oof ooo oop oor oos op- opd ope opf opo opp opr ops or- ord ore orf oro orp orr ors os- osd ose osf oso osp osr oss p-p pdd pde pdf pdo pdp pdr pds ped pee pef peo pep per pes pfd pfe pff pfo pfp pfr pfs pod poe pof poo pop por pos ppd ppe ppf ppo ppp ppr pps prd pre prf pro prp prr prs ps- psd pse psf pso psp psr pss rdd rde rdf rdo rdp rdr rds re- red ree ref reo rep rer res rfd rfe rff rfo rfp rfr rfs rod roe rof roo rop ror ros rpd rpe rpf rpo rpp rpr rps rrd rrf rrp rrr rrs rsd rse rsf rso rsp rsr rss sdd sde sdf sdo sdp sdr sds se- sed see sef seo sep ser ses sfd sfe sff sfo sfp sfr sfs sod soe sof soo sop sor sos spd spe spf spo spp spr sps sr- srd sre srf sro srp srr srs ss- ssd sse ssf sso ssp ssr sss