-er ddd dde ddo ddp ddr dds ddt de- ded dee deo dep der des det dev dod doe doo dop dor dos dot dov dpd dpe dpo dpp dpr dps dpt dpv drd dre dro drp drr drs drt drv dsd dse dso dsp dsr dss dst dsv dtd dte dto dtp dtr dts dtt dtv dvd dve dvp dvr dvs dvt ed- edd ede edo edp edr eds edt eed eee eeo eep eer ees eet eev eo- eod eoe eoo eop eor eos eot ep- epd epe epo epp epr eps ept erd ere ero erp err ers ert erv es- esd ese eso esp esr ess est esv etd ete eto etp etr ets ett etv evd eve evo evp evr evs evt evv odd ode odo odp odr ods odt odv oed oee oeo oep oer oes oet oo- ood ooo oop oor oos oot oov op- opd ope opo opp opr ops opt opv or- ord ore oro orp orr ors ort orv os- osd ose oso osp osr oss ost osv ot- otd ote oto otp otr ots ott otv ov- ovd ove ovo ovp ovs ovv p-p pdd pde pdo pdp pdr pds pdt pdv ped pee peo pep per pes pet pev pod poe poo pop por pos pot pov ppd ppe ppo ppp ppr pps ppt ppv prd pre pro prp prr prs prt prv ps- psd pse pso psp psr pss pst psv pt- ptd pte pto ptp ptr pts ptt ptv pvd pve pvo pvp pvr pvs pvt pvv rdd rde rdo rdp rdr rds rdt rdv re- red ree reo rep rer res ret rev rod roe roo rop ror ros rot rov rpd rpe rpo rpp rpr rps rpt rpv rrd rrp rrr rrs rrt rsd rse rso rsp rsr rss rst rsv rtd rte rto rtp rtr rts rtt rtv rvd rve rvo rvp rvr rvs rvt rvv sdd sde sdo sdp sdr sds sdt sdv se- sed see seo sep ser ses set sev sod soe soo sop sor sos sot sov spd spe spo spp spr sps spt spv sr- srd sre sro srp srr srs srt srv ss- ssd sse sso ssp ssr sss sst ssv std ste sto stp str sts stt stv svd sve svo svp svr svs svt svv tdd tde tdo tdp tdr tds tdt tdv te- ted tee teo tep ter tes tet tev to- tod toe too top tor tos tot tov tpd tpe tpo tpp tpr tps tpt tpv trd tre tro trp trr trs trt trv tsd tse tso tsp tsr tss tst tsv ttd tte tto ttp ttr tts ttt ttv tvd tve tvo tvp tvr tvs tvt v-e vdd vde vdo vdp vdr vds vdt vdv ved vee veo vep ver ves vet vod voe voo vop vor vos vot vov vpd vpe vpo vpp vpr vps vpt vrd vre vrp vrr vrs vrt vsd vse vso vsp vsr vss vst vsv vte vto vtr vts vtt vtv vvo vvr vvs vvt vvv