-er ddd dde ddi ddm ddo ddp ddr ddx de- ded dee dei dem deo dep der dex di- did die dii dim dio dip dir dix dmd dme dmi dmm dmo dmp dmr dmx dod doe doi dom doo dop dor dox dpd dpe dpi dpm dpo dpp dpr drd dre dri drm dro drp drr drx dxd dxi dxo dxp dxr dxx ed- edd ede edi edm edo edp edr edx eed eee eem eeo eep eer eex eid eie eii eim eio eip eir eix em- emd eme emi emm emo emp emr emx eo- eod eoe eoi eom eoo eop eor ep- epd epe epi epm epo epp epr epx erd ere eri erm ero erp err ex- exd exe exi exo exp exr exx i-d idd ide idi idm ido idp idr idx ie- ied iee iei iem iep ier iex iid iie iii iim iio iip iir iix im- imd ime imi imm imo imp imx io- iod ioe ioi iom ioo iop ior ipd ipe ipi ipm ipo ipp ipr ipx ir- ird ire iri irm iro irp irr irx ixe ixi m-o m-r mdd mde mdi mdm mdo mdp mdr mdx med mee mei mem meo mep mer mex mi- mid mie mii mim mio mip mir mix mmd mme mmi mmm mmo mmp mmr mmx mod moe moi mom moo mop mor mox mpd mpe mpi mpm mpo mpp mpr mpx mrd mre mri mrm mro mrp mrr mrx mxd mxi mxp mxr o-i odd ode odi odm odo odp odr oed oee oei oem oeo oep oer oex oid oie oii oim oio oip oir om- omd ome omi omm omo omp omr omx oo- ood ooi oom ooo oop oor oox op- opd ope opi opm opo opp opr opx or- ord ore ori orm oro orp orr orx ox- oxi oxo oxx p-p pdd pde pdi pdm pdo pdp pdr pdx ped pee pei pem peo pep per pex pid pie pii pim pio pip pir pix pmd pme pmi pmm pmo pmp pmr pmx pod poe poi pom poo pop por pox ppd ppe ppi ppm ppo ppp ppr ppx prd pre pri prm pro prp prr prx pxe pxm pxr rdd rde rdi rdm rdo rdp rdr rdx re- red ree rei rem reo rep rer rex rid rie rii rim rio rip rir rix rmd rme rmi rmm rmo rmp rmr rmx rod roe roi rom roo rop ror rox rpd rpe rpi rpm rpo rpp rpr rpx rrd rri rrm rrp rrr rxp rxr xde xdi xdm xdr xed xee xem xep xer xex xie xii xio xix xmd xmi xmm xmo xmp xmr xmx xod xoi xom xoo xop xor xox xpd xpe xpm xpo xpp xrd xrx xxi xxo xxp xxx