-er ddd dde ddg ddi ddp ddr dds de- ded dee deg dei dep der des dgd dge dgg dgi dgp dgr dgs di- did die dig dii dip dir dis dpd dpe dpg dpi dpp dpr dps drd dre drg dri drp drr drs dsd dse dsg dsi dsp dsr dss ed- edd ede edg edi edp edr eds eed eee eeg eep eer ees egd ege egg egi egp egr egs eid eie eig eii eip eir eis ep- epd epe epg epi epp epr eps erd ere erg eri erp err ers es- esd ese esg esi esp esr ess g-d g-p gdd gde gdi gdp gdr gds ge- ged gee geg gei gep ger ges ggd ggg ggi ggp ggr ggs gid gie gig gii gip gir gis gpd gpe gpg gpi gpp gpr gps grd gre grg gri grp grr grs gsd gse gsg gsi gsp gsr gss i-d idd ide idg idi idp idr ids ie- ied iee ieg iei iep ier ies igd ige igg igi igp igr igs iid iie iii iip iir iis ipd ipe ipg ipi ipp ipr ips ir- ird ire irg iri irp irr irs is- isd ise isg isi isp isr iss p-p pdd pde pdg pdi pdp pdr pds ped pee peg pei pep per pes pgd pge pgg pgi pgp pgr pgs pid pie pig pii pip pir pis ppd ppe ppg ppi ppp ppr pps prd pre prg pri prp prr prs ps- psd pse psg psi psp psr pss rdd rde rdg rdi rdp rdr rds re- red ree reg rei rep rer res rgd rge rgg rgi rgp rgr rgs rid rie rig rii rip rir ris rpd rpe rpg rpi rpp rpr rps rrd rrg rri rrp rrr rrs rsd rse rsg rsi rsp rsr rss sdd sde sdg sdi sdp sdr sds se- sed see seg sei sep ser ses sgd sge sgg sgi sgp sgr sgs sid sie sig sii sip sir sis spd spe spg spi spp spr sps sr- srd sre srg sri srp srr srs ss- ssd sse ssg ssi ssp ssr sss