-er ddd dde ddf ddo ddp ddr ddt de- ded dee def deo dep der det dfd dfe dff dfo dfp dfr dft dod doe dof doo dop dor dot dpd dpe dpf dpo dpp dpr dpt drd dre dro drp drr drt dtd dte dtf dto dtp dtr dtt ed- edd ede edf edo edp edr edt eed eee eef eeo eep eer eet ef- efd efe eff efo efp efr eft eo- eod eoe eof eoo eop eor eot ep- epd epe epf epo epp epr ept erd ere erf ero erp err ert etd ete etf eto etp etr ett fdd fde fdf fdo fdp fdr fdt fed fee fef feo fep fer fet ffd ffe fff ffo ffp ffr fft foe fof foo fop for fot fpd fpe fpo fpp fpr fpt frd fre frf fro frp frr frt ftd fte ftf fto ftp ftr ftt odd ode odf odo odp odr odt oed oee oef oeo oep oer oet of- ofd ofe off ofo ofp ofr oft oo- ood oof ooo oop oor oot op- opd ope opf opo opp opr opt or- ord ore orf oro orp orr ort ot- otd ote otf oto otp otr ott p-p pdd pde pdf pdo pdp pdr pdt ped pee pef peo pep per pet pfd pfe pff pfo pfp pfr pft pod poe pof poo pop por pot ppd ppe ppf ppo ppp ppr ppt prd pre prf pro prp prr prt pt- ptd pte ptf pto ptp ptr ptt rdd rde rdf rdo rdp rdr rdt re- red ree ref reo rep rer ret rfd rfe rff rfo rfp rfr rft rod roe rof roo rop ror rot rpd rpe rpf rpo rpp rpr rpt rrd rrf rrp rrr rrt rtd rte rtf rto rtp rtr rtt tdd tde tdf tdo tdp tdr tdt te- ted tee tef teo tep ter tet tfd tfe tff tfo tfp tfr tft to- tod toe tof too top tor tot tpd tpe tpf tpo tpp tpr tpt trd tre trf tro trp trr trt ttd tte ttf tto ttp ttr ttt