-er ddd dde ddf ddi ddp ddr dds de- ded dee def dei dep der des dfd dfe dff dfi dfp dfr dfs di- did die dif dii dip dir dis dpd dpe dpf dpi dpp dpr dps drd dre dri drp drr drs dsd dse dsf dsi dsp dsr dss ed- edd ede edf edi edp edr eds eed eee eef eep eer ees ef- efd efe eff efi efp efr efs eid eie eif eii eip eir eis ep- epd epe epf epi epp epr eps erd ere erf eri erp err ers es- esd ese esf esi esp esr ess fdd fde fdf fdi fdp fdr fds fed fee fef fei fep fer fes ffd ffe fff ffi ffp ffr ffs fid fie fif fii fip fir fis fpd fpe fpi fpp fpr fps frd fre frf fri frp frr frs fsd fse fsf fsi fsp fsr fss i-d i-f idd ide idf idi idp idr ids ie- ied iee ief iei iep ier ies ifd ife iff ifi ifp ifr ifs iid iie iif iii iip iir iis ipd ipe ipf ipi ipp ipr ips ir- ird ire irf iri irp irr irs is- isd ise isf isi isp isr iss p-p pdd pde pdf pdi pdp pdr pds ped pee pef pei pep per pes pfd pfe pff pfi pfp pfr pfs pid pie pif pii pip pir pis ppd ppe ppf ppi ppp ppr pps prd pre prf pri prp prr prs ps- psd pse psf psi psp psr pss rdd rde rdf rdi rdp rdr rds re- red ree ref rei rep rer res rfd rfe rff rfi rfp rfr rfs rid rie rif rii rip rir ris rpd rpe rpf rpi rpp rpr rps rrd rrf rri rrp rrr rrs rsd rse rsf rsi rsp rsr rss sdd sde sdf sdi sdp sdr sds se- sed see sef sei sep ser ses sfd sfe sff sfi sfp sfr sfs sid sie sif sii sip sir sis spd spe spf spi spp spr sps sr- srd sre srf sri srp srr srs ss- ssd sse ssf ssi ssp ssr sss