-er ddd dde ddm ddo ddp ddr dds de- ded dee dem deo dep der des dmd dme dmm dmo dmp dmr dms dod doe dom doo dop dor dos dpd dpe dpm dpo dpp dpr dps drd dre drm dro drp drr drs dsd dse dsm dso dsp dsr dss ed- edd ede edm edo edp edr eds eed eee eem eeo eep eer ees em- emd eme emm emo emp emr ems eo- eod eoe eom eoo eop eor eos ep- epd epe epm epo epp epr eps erd ere erm ero erp err ers es- esd ese esm eso esp esr ess m-o m-r mdd mde mdm mdo mdp mdr mds med mee mem meo mep mer mes mmd mme mmm mmo mmp mmr mms mod moe mom moo mop mor mos mpd mpe mpm mpo mpp mpr mps mrd mre mrm mro mrp mrr mrs msd mse msm mso msp msr mss odd ode odm odo odp odr ods oed oee oem oeo oep oer oes om- omd ome omm omo omp omr oms oo- ood oom ooo oop oor oos op- opd ope opm opo opp opr ops or- ord ore orm oro orp orr ors os- osd ose osm oso osp osr oss p-p pdd pde pdm pdo pdp pdr pds ped pee pem peo pep per pes pmd pme pmm pmo pmp pmr pms pod poe pom poo pop por pos ppd ppe ppm ppo ppp ppr pps prd pre prm pro prp prr prs ps- psd pse psm pso psp psr pss rdd rde rdm rdo rdp rdr rds re- red ree rem reo rep rer res rmd rme rmm rmo rmp rmr rms rod roe rom roo rop ror ros rpd rpe rpm rpo rpp rpr rps rrd rrm rrp rrr rrs rsd rse rsm rso rsp rsr rss sdd sde sdm sdo sdp sdr sds se- sed see sem seo sep ser ses smd sme smm smo smp smr sms sod soe som soo sop sor sos spd spe spm spo spp spr sps sr- srd sre srm sro srp srr srs ss- ssd sse ssm sso ssp ssr sss