-er ddd dde ddf ddk ddm ddo ddr dds ddu de- ded dee def dek dem deo der des deu dfd dfe dff dfk dfm dfo dfr dfs dfu dke dkk dkm dko dkr dks dku dmd dme dmf dmk dmm dmo dmr dms dmu dod doe dof dok dom doo dor dos dou drd dre drk drm dro drr drs dru dsd dse dsf dsk dsm dso dsr dss dsu dud due duf duk dum duo dur dus ed- edd ede edf edk edm edo edr eds edu eed eee eef eek eem eeo eer ees ef- efd efe eff efm efo efr efs ekd eke ekf eko ekr eks eku em- emd eme emf emk emm emo emr ems emu eo- eod eoe eof eok eom eoo eor eos eou erd ere erf erk erm ero err ers eru es- esd ese esf esk esm eso esr ess esu eu- eud eue euf eur eus fdd fde fdf fdk fdm fdo fdr fds fdu fed fee fef fek fem feo fer fes feu ffd ffe fff ffk ffm ffo ffr ffs ffu fkf fkk fkm fmd fme fmf fmm fmo fmr fms fmu foe fof fok fom foo for fos fou frd fre frf frk frm fro frr frs fru fsd fse fsf fsk fsm fso fsr fss fsu fud fue fuf fuk fum fuo fur fus fuu kde kdf kdk kdm kdo kdr kds kdu ke- ked kee kef kek kem keo ker kes kfd kff kfm kfo kfs kfu kke kkk kkm kkr kks kku kmd kme kmf kmk kmm kmo kms kmu kod koe kof kok kom koo kor kos kou krd krf krk kro krr krs kru ksd kse ksf ksk ksm kso ksr kss ksu kud kue kuk kum kur kus kuu m-f m-o m-r mdd mde mdf mdk mdm mdo mdr mds mdu med mee mef mek mem meo mer mes meu mfd mfe mff mfm mfo mfr mfs mfu mkd mke mkk mkm mko mkr mks mku mmd mme mmf mmk mmm mmo mmr mms mmu mod moe mof mok mom moo mor mos mou mrd mre mrf mrk mrm mro mrr mrs mru msd mse msf msk msm mso msr mss msu mud mue muf muk mum mur mus muu odd ode odf odm odo odr ods odu oed oee oef oem oeo oer oes of- ofd ofe off ofm ofo ofr ofs ofu okd oke okk oko okr oks oku om- omd ome omf omm omo omr oms omu oo- ood oof ook oom ooo oor oos or- ord ore orf ork orm oro orr ors oru os- osd ose osf osk osm oso osr oss osu ou- oud oue ouf ouk oum ouo our ous rdd rde rdf rdm rdo rdr rds rdu re- red ree ref rek rem reo rer res reu rfd rfe rff rfk rfm rfo rfr rfs rfu rke rkf rkk rkm rko rks rku rmd rme rmf rmm rmo rmr rms rod roe rof rok rom roo ror ros rou rrd rrf rrk rrm rrr rrs rru rsd rse rsf rsk rsm rso rsr rss rsu rud rue ruf ruk rum ruo rur rus ruu sdd sde sdf sdk sdm sdo sdr sds sdu se- sed see sef sek sem seo ser ses seu sfd sfe sff sfk sfm sfo sfr sfs sfu sk- skd ske skf skk skm sko skr sks sku smd sme smf smk smm smo smr sms smu sod soe sof sok som soo sor sos sou sr- srd sre srf srk srm sro srr srs ss- ssd sse ssf ssk ssm sso ssr sss ssu sud sue suf suk sum suo sur sus suu udd ude udf udk udm udo udr uds udu ued uee uef uem uer ues ufd ufe uff ufm ufo ufr ufs ufu uke ukf ukk ukr uku um- umd ume umf umm umo umr ums umu uod uoe uok uom uoo uor uos ur- urd ure urf urk urm uro urr urs uru usd use usf usk usm uso usr uss usu uue uum uur uus uuu