-er ddd dde ddg ddi ddr dds ddx de- ded dee deg dei der des dex dgd dge dgg dgi dgr dgs di- did die dig dii dir dis dix drd dre drg dri drr drs drx dsd dse dsg dsi dsr dss dsx dxd dxi dxr dxs dxx ed- edd ede edg edi edr eds edx eed eee eeg eer ees eex egd ege egg egi egr egs egx eid eie eig eii eir eis eix erd ere erg eri err ers es- esd ese esg esi esr ess esx ex- exd exe exi exr exs exx g-d gdd gde gdi gdr gds gdx ge- ged gee geg gei ger ges gex ggd ggg ggi ggr ggs gid gie gig gii gir gis grd gre grg gri grr grs grx gsd gse gsg gsi gsr gss gsx gxs i-d idd ide idg idi idr ids idx ie- ied iee ieg iei ier ies iex igd ige igg igi igr igs iid iie iii iir iis iix ir- ird ire irg iri irr irs irx is- isd ise isg isi isr iss ixe ixi rdd rde rdg rdi rdr rds rdx re- red ree reg rei rer res rex rgd rge rgg rgi rgr rgs rgx rid rie rig rii rir ris rix rrd rrg rri rrr rrs rsd rse rsg rsi rsr rss rsx rxr rxs sdd sde sdg sdi sdr sds se- sed see seg sei ser ses sex sgd sge sgg sgi sgr sgs sgx sid sie sig sii sir sis six sr- srd sre srg sri srr srs srx ss- ssd sse ssg ssi ssr sss ssx sxi sxs xde xdi xdr xds xed xee xeg xer xes xex xge xgi xie xii xis xix xrd xrx xsi xss xxi xxx