-er ddd dde ddm ddo ddp ddr ddx de- ded dee dem deo dep der dex dmd dme dmm dmo dmp dmr dmx dod doe dom doo dop dor dox dpd dpe dpm dpo dpp dpr drd dre drm dro drp drr drx dxd dxo dxp dxr dxx ed- edd ede edm edo edp edr edx eed eee eem eeo eep eer eex em- emd eme emm emo emp emr emx eo- eod eoe eom eoo eop eor ep- epd epe epm epo epp epr epx erd ere erm ero erp err ex- exd exe exo exp exr exx m-o m-r mdd mde mdm mdo mdp mdr mdx med mee mem meo mep mer mex mmd mme mmm mmo mmp mmr mmx mod moe mom moo mop mor mox mpd mpe mpm mpo mpp mpr mpx mrd mre mrm mro mrp mrr mrx mxd mxp mxr odd ode odm odo odp odr oed oee oem oeo oep oer oex om- omd ome omm omo omp omr omx oo- ood oom ooo oop oor oox op- opd ope opm opo opp opr opx or- ord ore orm oro orp orr orx ox- oxo oxx p-p pdd pde pdm pdo pdp pdr pdx ped pee pem peo pep per pex pmd pme pmm pmo pmp pmr pmx pod poe pom poo pop por pox ppd ppe ppm ppo ppp ppr ppx prd pre prm pro prp prr prx pxe pxm pxr rdd rde rdm rdo rdp rdr rdx re- red ree rem reo rep rer rex rmd rme rmm rmo rmp rmr rmx rod roe rom roo rop ror rox rpd rpe rpm rpo rpp rpr rpx rrd rrm rrp rrr rxp rxr xde xdm xdr xed xee xem xep xer xex xmd xmm xmo xmp xmr xmx xod xom xoo xop xor xox xpd xpe xpm xpo xpp xrd xrx xxo xxp xxx