-er ddd dde ddn ddo ddr dds de- ded dee den deo der des dnd dne dnn dno dnr dns dod doe don doo dor dos drd dre drn dro drr drs dsd dse dsn dso dsr dss ed- edd ede edn edo edr eds eed eee een eeo eer ees en- end ene enn eno enr ens eo- eod eoe eon eoo eor eos erd ere ern ero err ers es- esd ese esn eso esr ess ndd nde ndn ndo ndr nds ne- ned nee nen neo ner nes nne nnn nno nns no- nod noe non noo nor nos nrd nre nrn nro nrr nrs nsd nse nsn nso nsr nss odd ode odn odo odr ods oed oee oen oeo oer oes on- ond one onn ono onr ons oo- ood oon ooo oor oos or- ord ore orn oro orr ors os- osd ose osn oso osr oss rdd rde rdn rdo rdr rds re- red ree ren reo rer res rnd rnn rno rnr rns rod roe ron roo ror ros rrd rrn rrr rrs rsd rse rsn rso rsr rss sdd sde sdn sdo sdr sds se- sed see sen seo ser ses snd sne snn sno snr sns sod soe son soo sor sos sr- srd sre srn sro srr srs ss- ssd sse ssn sso ssr sss