-er ddd dde ddf ddi ddo ddp ddr dds ddt de- ded dee def dei deo dep der des det dfd dfe dff dfi dfo dfp dfr dfs dft di- did die dif dii dio dip dir dis dit dod doe dof doi doo dop dor dos dot dpd dpe dpf dpi dpo dpp dpr dps dpt drd dre dri dro drp drr drs drt dsd dse dsf dsi dso dsp dsr dss dst dtd dte dtf dti dto dtp dtr dts dtt ed- edd ede edf edi edo edp edr eds edt eed eee eef eeo eep eer ees eet ef- efd efe eff efi efo efp efr efs eft eid eie eif eii eio eip eir eis eit eo- eod eoe eof eoi eoo eop eor eos eot ep- epd epe epf epi epo epp epr eps ept erd ere erf eri ero erp err ers ert es- esd ese esf esi eso esp esr ess est etd ete etf eti eto etp etr ets ett fdd fde fdf fdi fdo fdp fdr fds fdt fed fee fef fei feo fep fer fes fet ffd ffe fff ffi ffo ffp ffr ffs fft fid fie fif fii fip fir fis fit foe fof foi foo fop for fos fot fpd fpe fpi fpo fpp fpr fps fpt frd fre frf fri fro frp frr frs frt fsd fse fsf fsi fso fsp fsr fss fst ftd fte ftf fti fto ftp ftr fts ftt i-d i-f idd ide idf idi ido idp idr ids idt ie- ied iee ief iei iep ier ies iet ifd ife iff ifi ifo ifp ifr ifs ift iid iie iif iii iio iip iir iis iit io- iod ioe iof ioi ioo iop ior ios iot ipd ipe ipf ipi ipo ipp ipr ips ipt ir- ird ire irf iri iro irp irr irs irt is- isd ise isf isi iso isp isr iss ist itd ite itf iti ito itp its itt o-i odd ode odf odi odo odp odr ods odt oed oee oef oei oeo oep oer oes oet of- ofd ofe off ofi ofo ofp ofr ofs oft oid oie oif oii oio oip oir ois oit oo- ood oof ooi ooo oop oor oos oot op- opd ope opf opi opo opp opr ops opt or- ord ore orf ori oro orp orr ors ort os- osd ose osf osi oso osp osr oss ost ot- otd ote otf oti oto otp otr ots ott p-p pdd pde pdf pdi pdo pdp pdr pds pdt ped pee pef pei peo pep per pes pet pfd pfe pff pfi pfo pfp pfr pfs pft pid pie pif pii pio pip pir pis pit pod poe pof poi poo pop por pos pot ppd ppe ppf ppi ppo ppp ppr pps ppt prd pre prf pri pro prp prr prs prt ps- psd pse psf psi pso psp psr pss pst pt- ptd pte ptf pti pto ptp ptr pts ptt rdd rde rdf rdi rdo rdp rdr rds rdt re- red ree ref rei reo rep rer res ret rfd rfe rff rfi rfo rfp rfr rfs rft rid rie rif rii rio rip rir ris rit rod roe rof roi roo rop ror ros rot rpd rpe rpf rpi rpo rpp rpr rps rpt rrd rrf rri rrp rrr rrs rrt rsd rse rsf rsi rso rsp rsr rss rst rtd rte rtf rti rto rtp rtr rts rtt sdd sde sdf sdi sdo sdp sdr sds sdt se- sed see sef sei seo sep ser ses set sfd sfe sff sfi sfo sfp sfr sfs sft sid sie sif sii sio sip sir sis sit sod soe sof soi soo sop sor sos sot spd spe spf spi spo spp spr sps spt sr- srd sre srf sri sro srp srr srs srt ss- ssd sse ssf ssi sso ssp ssr sss sst std ste stf sti sto stp str sts stt tdd tde tdf tdi tdo tdp tdr tds tdt te- ted tee tef tei teo tep ter tes tet tfd tfe tff tfi tfo tfp tfr tfs tft tid tie tif tii tio tip tir tis tit to- tod toe tof toi too top tor tos tot tpd tpe tpf tpi tpo tpp tpr tps tpt trd tre trf tri tro trp trr trs trt tsd tse tsf tsi tso tsp tsr tss tst ttd tte ttf tti tto ttp ttr tts ttt