-er ddd dde ddi ddm ddo ddr ddx de- ded dee dei dem deo der dex di- did die dii dim dio dir dix dmd dme dmi dmm dmo dmr dmx dod doe doi dom doo dor dox drd dre dri drm dro drr drx dxd dxi dxo dxr dxx ed- edd ede edi edm edo edr edx eed eee eem eeo eer eex eid eie eii eim eio eir eix em- emd eme emi emm emo emr emx eo- eod eoe eoi eom eoo eor erd ere eri erm ero err ex- exd exe exi exo exr exx i-d idd ide idi idm ido idr idx ie- ied iee iei iem ier iex iid iie iii iim iio iir iix im- imd ime imi imm imo imx io- iod ioe ioi iom ioo ior ir- ird ire iri irm iro irr irx ixe ixi m-o m-r mdd mde mdi mdm mdo mdr mdx med mee mei mem meo mer mex mi- mid mie mii mim mio mir mix mmd mme mmi mmm mmo mmr mmx mod moe moi mom moo mor mox mrd mre mri mrm mro mrr mrx mxd mxi mxr o-i odd ode odi odm odo odr oed oee oei oem oeo oer oex oid oie oii oim oio oir om- omd ome omi omm omo omr omx oo- ood ooi oom ooo oor oox or- ord ore ori orm oro orr orx ox- oxi oxo oxx rdd rde rdi rdm rdo rdr rdx re- red ree rei rem reo rer rex rid rie rii rim rio rir rix rmd rme rmi rmm rmo rmr rmx rod roe roi rom roo ror rox rrd rri rrm rrr rxr xde xdi xdm xdr xed xee xem xer xex xie xii xio xix xmd xmi xmm xmo xmr xmx xod xoi xom xoo xor xox xrd xrx xxi xxo xxx