-er -ol ddd dde ddf ddk ddl ddo ddr dds de- ded dee def dek del deo der des dfd dfe dff dfk dfl dfo dfr dfs dke dkk dkl dko dkr dks dl- dld dle dlf dlk dll dlo dlr dls dod doe dof dok dol doo dor dos drd dre drk drl dro drr drs dsd dse dsf dsk dsl dso dsr dss ed- edd ede edf edk edl edo edr eds eed eee eef eek eel eeo eer ees ef- efd efe eff efl efo efr efs ekd eke ekf ekl eko ekr eks eld ele elf elk ell elo elr els eo- eod eoe eof eok eol eoo eor eos erd ere erf erk erl ero err ers es- esd ese esf esk esl eso esr ess fdd fde fdf fdk fdl fdo fdr fds fed fee fef fek fel feo fer fes ffd ffe fff ffk ffl ffo ffr ffs fkf fkk fkl fld fle flf fll flo flr fls foe fof fok fol foo for fos frd fre frf frk frl fro frr frs fsd fse fsf fsk fsl fso fsr fss kde kdf kdk kdl kdo kdr kds ke- ked kee kef kek kel keo ker kes kfd kff kfo kfs kke kkk kkl kkr kks kl- kld klf klo klr kls kod koe kof kok kol koo kor kos krd krf krk krl kro krr krs ksd kse ksf ksk ksl kso ksr kss ldd lde ldf ldk ldl ldo ldr lds led lee lef lek lel leo ler les lfd lfe lff lfk lfl lfo lfr lfs lkl lkr lks lld lle llf llk lll llo llr lls lod loe lof lok lol loo lor los lrd lrf lrk lro lrr lrs lsd lse lsf lsk lsl lso lsr lss odd ode odf odl odo odr ods oed oee oef oel oeo oer oes of- ofd ofe off ofl ofo ofr ofs okd oke okk okl oko okr oks old ole olf olk oll olo ols oo- ood oof ook ool ooo oor oos or- ord ore orf ork orl oro orr ors os- osd ose osf osk osl oso osr oss rdd rde rdf rdl rdo rdr rds re- red ree ref rek rel reo rer res rfd rfe rff rfk rfl rfo rfr rfs rke rkf rkk rko rks rld rle rlf rll rlo rlr rls rod roe rof rok rol roo ror ros rrd rrf rrk rrl rrr rrs rsd rse rsf rsk rsl rso rsr rss sdd sde sdf sdk sdl sdo sdr sds se- sed see sef sek sel seo ser ses sfd sfe sff sfk sfl sfo sfr sfs sk- skd ske skf skk skl sko skr sks sld sle slf slk sll slo slr sls sod soe sof sok sol soo sor sos sr- srd sre srf srk srl sro srr srs ss- ssd sse ssf ssk ssl sso ssr sss