-er ddd dde ddg ddn ddo ddr ddx de- ded dee deg den deo der dex dgd dge dgg dgn dgr dnd dne dng dnn dno dnr dod doe dog don doo dor dox drd dre drg drn dro drr drx dxd dxn dxo dxr dxx ed- edd ede edg edn edo edr edx eed eee eeg een eeo eer eex egd ege egg egn ego egr egx en- end ene eng enn eno enr eo- eod eoe eog eon eoo eor erd ere erg ern ero err ex- exd exe exo exr exx g-d gdd gde gdn gdo gdr gdx ge- ged gee geg gen geo ger gex ggd ggg ggn ggo ggr gnd gne gnn gno gnr god goe gog gon goo gor gox grd gre grg grn gro grr grx ndd nde ndg ndn ndo ndr ne- ned nee neg nen neo ner nex ngd nge ngg ngn ngo nne nng nnn nno no- nod noe nog non noo nor nox nrd nre nrg nrn nro nrr nrx nxd odd ode odg odn odo odr oed oee oeg oen oeo oer oex ogd oge ogg ogn ogo ogx on- ond one ong onn ono onr onx oo- ood oog oon ooo oor oox or- ord ore org orn oro orr orx ox- oxn oxo oxx rdd rde rdg rdn rdo rdr rdx re- red ree reg ren reo rer rex rgd rge rgg rgn rgo rgr rgx rnd rng rnn rno rnr rod roe rog ron roo ror rox rrd rrg rrn rrr rxr xde xdr xed xee xeg xen xer xex xge xno xod xog xon xoo xor xox xrd xrx xxo xxx