-er ddd dde ddf ddi ddp ddr dds ddt de- ded dee def dei dep der des det dfd dfe dff dfi dfp dfr dfs dft di- did die dif dii dip dir dis dit dpd dpe dpf dpi dpp dpr dps dpt drd dre dri drp drr drs drt dsd dse dsf dsi dsp dsr dss dst dtd dte dtf dti dtp dtr dts dtt ed- edd ede edf edi edp edr eds edt eed eee eef eep eer ees eet ef- efd efe eff efi efp efr efs eft eid eie eif eii eip eir eis eit ep- epd epe epf epi epp epr eps ept erd ere erf eri erp err ers ert es- esd ese esf esi esp esr ess est etd ete etf eti etp etr ets ett fdd fde fdf fdi fdp fdr fds fdt fed fee fef fei fep fer fes fet ffd ffe fff ffi ffp ffr ffs fft fid fie fif fii fip fir fis fit fpd fpe fpi fpp fpr fps fpt frd fre frf fri frp frr frs frt fsd fse fsf fsi fsp fsr fss fst ftd fte ftf fti ftp ftr fts ftt i-d i-f idd ide idf idi idp idr ids idt ie- ied iee ief iei iep ier ies iet ifd ife iff ifi ifp ifr ifs ift iid iie iif iii iip iir iis iit ipd ipe ipf ipi ipp ipr ips ipt ir- ird ire irf iri irp irr irs irt is- isd ise isf isi isp isr iss ist itd ite itf iti itp its itt p-p pdd pde pdf pdi pdp pdr pds pdt ped pee pef pei pep per pes pet pfd pfe pff pfi pfp pfr pfs pft pid pie pif pii pip pir pis pit ppd ppe ppf ppi ppp ppr pps ppt prd pre prf pri prp prr prs prt ps- psd pse psf psi psp psr pss pst pt- ptd pte ptf pti ptp ptr pts ptt rdd rde rdf rdi rdp rdr rds rdt re- red ree ref rei rep rer res ret rfd rfe rff rfi rfp rfr rfs rft rid rie rif rii rip rir ris rit rpd rpe rpf rpi rpp rpr rps rpt rrd rrf rri rrp rrr rrs rrt rsd rse rsf rsi rsp rsr rss rst rtd rte rtf rti rtp rtr rts rtt sdd sde sdf sdi sdp sdr sds sdt se- sed see sef sei sep ser ses set sfd sfe sff sfi sfp sfr sfs sft sid sie sif sii sip sir sis sit spd spe spf spi spp spr sps spt sr- srd sre srf sri srp srr srs srt ss- ssd sse ssf ssi ssp ssr sss sst std ste stf sti stp str sts stt tdd tde tdf tdi tdp tdr tds tdt te- ted tee tef tei tep ter tes tet tfd tfe tff tfi tfp tfr tfs tft tid tie tif tii tip tir tis tit tpd tpe tpf tpi tpp tpr tps tpt trd tre trf tri trp trr trs trt tsd tse tsf tsi tsp tsr tss tst ttd tte ttf tti ttp ttr tts ttt