-er ddd dde ddf ddm ddo ddp ddr de- ded dee def dem deo dep der dfd dfe dff dfm dfo dfp dfr dmd dme dmf dmm dmo dmp dmr dod doe dof dom doo dop dor dpd dpe dpf dpm dpo dpp dpr drd dre drm dro drp drr ed- edd ede edf edm edo edp edr eed eee eef eem eeo eep eer ef- efd efe eff efm efo efp efr em- emd eme emf emm emo emp emr eo- eod eoe eof eom eoo eop eor ep- epd epe epf epm epo epp epr erd ere erf erm ero erp err fdd fde fdf fdm fdo fdp fdr fed fee fef fem feo fep fer ffd ffe fff ffm ffo ffp ffr fmd fme fmf fmm fmo fmp fmr foe fof fom foo fop for fpd fpe fpm fpo fpp fpr frd fre frf frm fro frp frr m-f m-o m-r mdd mde mdf mdm mdo mdp mdr med mee mef mem meo mep mer mfd mfe mff mfm mfo mfp mfr mmd mme mmf mmm mmo mmp mmr mod moe mof mom moo mop mor mpd mpe mpf mpm mpo mpp mpr mrd mre mrf mrm mro mrp mrr odd ode odf odm odo odp odr oed oee oef oem oeo oep oer of- ofd ofe off ofm ofo ofp ofr om- omd ome omf omm omo omp omr oo- ood oof oom ooo oop oor op- opd ope opf opm opo opp opr or- ord ore orf orm oro orp orr p-p pdd pde pdf pdm pdo pdp pdr ped pee pef pem peo pep per pfd pfe pff pfm pfo pfp pfr pmd pme pmf pmm pmo pmp pmr pod poe pof pom poo pop por ppd ppe ppf ppm ppo ppp ppr prd pre prf prm pro prp prr rdd rde rdf rdm rdo rdp rdr re- red ree ref rem reo rep rer rfd rfe rff rfm rfo rfp rfr rmd rme rmf rmm rmo rmp rmr rod roe rof rom roo rop ror rpd rpe rpf rpm rpo rpp rpr rrd rrf rrm rrp rrr