-er ddd dde ddm ddo ddp ddr dds ddt de- ded dee dem deo dep der des det dmd dme dmm dmo dmp dmr dms dmt dod doe dom doo dop dor dos dot dpd dpe dpm dpo dpp dpr dps dpt drd dre drm dro drp drr drs drt dsd dse dsm dso dsp dsr dss dst dtd dte dtm dto dtp dtr dts dtt ed- edd ede edm edo edp edr eds edt eed eee eem eeo eep eer ees eet em- emd eme emm emo emp emr ems emt eo- eod eoe eom eoo eop eor eos eot ep- epd epe epm epo epp epr eps ept erd ere erm ero erp err ers ert es- esd ese esm eso esp esr ess est etd ete etm eto etp etr ets ett m-o m-r mdd mde mdm mdo mdp mdr mds mdt med mee mem meo mep mer mes met mmd mme mmm mmo mmp mmr mms mmt mod moe mom moo mop mor mos mot mpd mpe mpm mpo mpp mpr mps mpt mrd mre mrm mro mrp mrr mrs mrt msd mse msm mso msp msr mss mst mtd mte mtm mto mtp mtr mts mtt odd ode odm odo odp odr ods odt oed oee oem oeo oep oer oes oet om- omd ome omm omo omp omr oms omt oo- ood oom ooo oop oor oos oot op- opd ope opm opo opp opr ops opt or- ord ore orm oro orp orr ors ort os- osd ose osm oso osp osr oss ost ot- otd ote otm oto otp otr ots ott p-p pdd pde pdm pdo pdp pdr pds pdt ped pee pem peo pep per pes pet pmd pme pmm pmo pmp pmr pms pmt pod poe pom poo pop por pos pot ppd ppe ppm ppo ppp ppr pps ppt prd pre prm pro prp prr prs prt ps- psd pse psm pso psp psr pss pst pt- ptd pte ptm pto ptp ptr pts ptt rdd rde rdm rdo rdp rdr rds rdt re- red ree rem reo rep rer res ret rmd rme rmm rmo rmp rmr rms rmt rod roe rom roo rop ror ros rot rpd rpe rpm rpo rpp rpr rps rpt rrd rrm rrp rrr rrs rrt rsd rse rsm rso rsp rsr rss rst rtd rte rtm rto rtp rtr rts rtt sdd sde sdm sdo sdp sdr sds sdt se- sed see sem seo sep ser ses set smd sme smm smo smp smr sms smt sod soe som soo sop sor sos sot spd spe spm spo spp spr sps spt sr- srd sre srm sro srp srr srs srt ss- ssd sse ssm sso ssp ssr sss sst std ste stm sto stp str sts stt tdd tde tdm tdo tdp tdr tds tdt te- ted tee tem teo tep ter tes tet tmd tme tmm tmo tmp tmr tms tmt to- tod toe tom too top tor tos tot tpd tpe tpm tpo tpp tpr tps tpt trd tre trm tro trp trr trs trt tsd tse tsm tso tsp tsr tss tst ttd tte ttm tto ttp ttr tts ttt