-er ddd dde ddf ddk ddo ddp ddr dds de- ded dee def dek deo dep der des dfd dfe dff dfk dfo dfp dfr dfs dke dkk dko dkp dkr dks dod doe dof dok doo dop dor dos dpd dpe dpf dpk dpo dpp dpr dps drd dre drk dro drp drr drs dsd dse dsf dsk dso dsp dsr dss ed- edd ede edf edk edo edp edr eds eed eee eef eek eeo eep eer ees ef- efd efe eff efo efp efr efs ekd eke ekf eko ekp ekr eks eo- eod eoe eof eok eoo eop eor eos ep- epd epe epf epo epp epr eps erd ere erf erk ero erp err ers es- esd ese esf esk eso esp esr ess fdd fde fdf fdk fdo fdp fdr fds fed fee fef fek feo fep fer fes ffd ffe fff ffk ffo ffp ffr ffs fkf fkk fkp foe fof fok foo fop for fos fpd fpe fpk fpo fpp fpr fps frd fre frf frk fro frp frr frs fsd fse fsf fsk fso fsp fsr fss kde kdf kdk kdo kdp kdr kds ke- ked kee kef kek keo kep ker kes kfd kff kfo kfs kke kkk kkp kkr kks kod koe kof kok koo kop kor kos kpd kpe kpf kpk kpo kpp kpr kps krd krf krk kro krp krr krs ksd kse ksf ksk kso ksp ksr kss odd ode odf odo odp odr ods oed oee oef oeo oep oer oes of- ofd ofe off ofo ofp ofr ofs okd oke okk oko okp okr oks oo- ood oof ook ooo oop oor oos op- opd ope opf opk opo opp opr ops or- ord ore orf ork oro orp orr ors os- osd ose osf osk oso osp osr oss p-p pdd pde pdf pdk pdo pdp pdr pds ped pee pef pek peo pep per pes pfd pfe pff pfk pfo pfp pfr pfs pkd pke pkf pko pkp pkr pks pod poe pof pok poo pop por pos ppd ppe ppf ppk ppo ppp ppr pps prd pre prf prk pro prp prr prs ps- psd pse psf psk pso psp psr pss rdd rde rdf rdo rdp rdr rds re- red ree ref rek reo rep rer res rfd rfe rff rfk rfo rfp rfr rfs rke rkf rkk rko rkp rks rod roe rof rok roo rop ror ros rpd rpe rpf rpk rpo rpp rpr rps rrd rrf rrk rrp rrr rrs rsd rse rsf rsk rso rsp rsr rss sdd sde sdf sdk sdo sdp sdr sds se- sed see sef sek seo sep ser ses sfd sfe sff sfk sfo sfp sfr sfs sk- skd ske skf skk sko skp skr sks sod soe sof sok soo sop sor sos spd spe spf spk spo spp spr sps sr- srd sre srf srk sro srp srr srs ss- ssd sse ssf ssk sso ssp ssr sss