-er ddd dde ddi ddm ddp ddr ddx de- ded dee dei dem dep der dex di- did die dii dim dip dir dix dmd dme dmi dmm dmp dmr dmx dpd dpe dpi dpm dpp dpr drd dre dri drm drp drr drx dxd dxi dxp dxr dxx ed- edd ede edi edm edp edr edx eed eee eem eep eer eex eid eie eii eim eip eir eix em- emd eme emi emm emp emr emx ep- epd epe epi epm epp epr epx erd ere eri erm erp err ex- exd exe exi exp exr exx i-d idd ide idi idm idp idr idx ie- ied iee iei iem iep ier iex iid iie iii iim iip iir iix im- imd ime imi imm imp imx ipd ipe ipi ipm ipp ipr ipx ir- ird ire iri irm irp irr irx ixe ixi m-r mdd mde mdi mdm mdp mdr mdx med mee mei mem mep mer mex mi- mid mie mii mim mip mir mix mmd mme mmi mmm mmp mmr mmx mpd mpe mpi mpm mpp mpr mpx mrd mre mri mrm mrp mrr mrx mxd mxi mxp mxr p-p pdd pde pdi pdm pdp pdr pdx ped pee pei pem pep per pex pid pie pii pim pip pir pix pmd pme pmi pmm pmp pmr pmx ppd ppe ppi ppm ppp ppr ppx prd pre pri prm prp prr prx pxe pxm pxr rdd rde rdi rdm rdp rdr rdx re- red ree rei rem rep rer rex rid rie rii rim rip rir rix rmd rme rmi rmm rmp rmr rmx rpd rpe rpi rpm rpp rpr rpx rrd rri rrm rrp rrr rxp rxr xde xdi xdm xdr xed xee xem xep xer xex xie xii xix xmd xmi xmm xmp xmr xmx xpd xpe xpm xpp xrd xrx xxi xxp xxx