-er ddd dde ddm ddp ddr dds ddt de- ded dee dem dep der des det dmd dme dmm dmp dmr dms dmt dpd dpe dpm dpp dpr dps dpt drd dre drm drp drr drs drt dsd dse dsm dsp dsr dss dst dtd dte dtm dtp dtr dts dtt ed- edd ede edm edp edr eds edt eed eee eem eep eer ees eet em- emd eme emm emp emr ems emt ep- epd epe epm epp epr eps ept erd ere erm erp err ers ert es- esd ese esm esp esr ess est etd ete etm etp etr ets ett m-r mdd mde mdm mdp mdr mds mdt med mee mem mep mer mes met mmd mme mmm mmp mmr mms mmt mpd mpe mpm mpp mpr mps mpt mrd mre mrm mrp mrr mrs mrt msd mse msm msp msr mss mst mtd mte mtm mtp mtr mts mtt p-p pdd pde pdm pdp pdr pds pdt ped pee pem pep per pes pet pmd pme pmm pmp pmr pms pmt ppd ppe ppm ppp ppr pps ppt prd pre prm prp prr prs prt ps- psd pse psm psp psr pss pst pt- ptd pte ptm ptp ptr pts ptt rdd rde rdm rdp rdr rds rdt re- red ree rem rep rer res ret rmd rme rmm rmp rmr rms rmt rpd rpe rpm rpp rpr rps rpt rrd rrm rrp rrr rrs rrt rsd rse rsm rsp rsr rss rst rtd rte rtm rtp rtr rts rtt sdd sde sdm sdp sdr sds sdt se- sed see sem sep ser ses set smd sme smm smp smr sms smt spd spe spm spp spr sps spt sr- srd sre srm srp srr srs srt ss- ssd sse ssm ssp ssr sss sst std ste stm stp str sts stt tdd tde tdm tdp tdr tds tdt te- ted tee tem tep ter tes tet tmd tme tmm tmp tmr tms tmt tpd tpe tpm tpp tpr tps tpt trd tre trm trp trr trs trt tsd tse tsm tsp tsr tss tst ttd tte ttm ttp ttr tts ttt