-er ddd dde ddi ddm ddr ddx de- ded dee dei dem der dex di- did die dii dim dir dix dmd dme dmi dmm dmr dmx drd dre dri drm drr drx dxd dxi dxr dxx ed- edd ede edi edm edr edx eed eee eem eer eex eid eie eii eim eir eix em- emd eme emi emm emr emx erd ere eri erm err ex- exd exe exi exr exx i-d idd ide idi idm idr idx ie- ied iee iei iem ier iex iid iie iii iim iir iix im- imd ime imi imm imx ir- ird ire iri irm irr irx ixe ixi m-r mdd mde mdi mdm mdr mdx med mee mei mem mer mex mi- mid mie mii mim mir mix mmd mme mmi mmm mmr mmx mrd mre mri mrm mrr mrx mxd mxi mxr rdd rde rdi rdm rdr rdx re- red ree rei rem rer rex rid rie rii rim rir rix rmd rme rmi rmm rmr rmx rrd rri rrm rrr rxr xde xdi xdm xdr xed xee xem xer xex xie xii xix xmd xmi xmm xmr xmx xrd xrx xxi xxx