-er ddd dde ddm ddo ddr dds ddu de- ded dee dem deo der des deu dmd dme dmm dmo dmr dms dmu dod doe dom doo dor dos dou drd dre drm dro drr drs dru dsd dse dsm dso dsr dss dsu dud due dum duo dur dus ed- edd ede edm edo edr eds edu eed eee eem eeo eer ees em- emd eme emm emo emr ems emu eo- eod eoe eom eoo eor eos eou erd ere erm ero err ers eru es- esd ese esm eso esr ess esu eu- eud eue eur eus m-o m-r mdd mde mdm mdo mdr mds mdu med mee mem meo mer mes meu mmd mme mmm mmo mmr mms mmu mod moe mom moo mor mos mou mrd mre mrm mro mrr mrs mru msd mse msm mso msr mss msu mud mue mum mur mus muu odd ode odm odo odr ods odu oed oee oem oeo oer oes om- omd ome omm omo omr oms omu oo- ood oom ooo oor oos or- ord ore orm oro orr ors oru os- osd ose osm oso osr oss osu ou- oud oue oum ouo our ous rdd rde rdm rdo rdr rds rdu re- red ree rem reo rer res reu rmd rme rmm rmo rmr rms rod roe rom roo ror ros rou rrd rrm rrr rrs rru rsd rse rsm rso rsr rss rsu rud rue rum ruo rur rus ruu sdd sde sdm sdo sdr sds sdu se- sed see sem seo ser ses seu smd sme smm smo smr sms smu sod soe som soo sor sos sou sr- srd sre srm sro srr srs ss- ssd sse ssm sso ssr sss ssu sud sue sum suo sur sus suu udd ude udm udo udr uds udu ued uee uem uer ues um- umd ume umm umo umr ums umu uod uoe uom uoo uor uos ur- urd ure urm uro urr urs uru usd use usm uso usr uss usu uue uum uur uus uuu