-er ddd dde ddg ddi ddo ddp ddr dds de- ded dee deg dei deo dep der des dgd dge dgg dgi dgp dgr dgs di- did die dig dii dio dip dir dis dod doe dog doi doo dop dor dos dpd dpe dpg dpi dpo dpp dpr dps drd dre drg dri dro drp drr drs dsd dse dsg dsi dso dsp dsr dss ed- edd ede edg edi edo edp edr eds eed eee eeg eeo eep eer ees egd ege egg egi ego egp egr egs eid eie eig eii eio eip eir eis eo- eod eoe eog eoi eoo eop eor eos ep- epd epe epg epi epo epp epr eps erd ere erg eri ero erp err ers es- esd ese esg esi eso esp esr ess g-d g-p gdd gde gdi gdo gdp gdr gds ge- ged gee geg gei geo gep ger ges ggd ggg ggi ggo ggp ggr ggs gid gie gig gii gio gip gir gis god goe gog goi goo gop gor gos gpd gpe gpg gpi gpo gpp gpr gps grd gre grg gri gro grp grr grs gsd gse gsg gsi gso gsp gsr gss i-d idd ide idg idi ido idp idr ids ie- ied iee ieg iei iep ier ies igd ige igg igi igo igp igr igs iid iie iii iio iip iir iis io- iod ioe iog ioi ioo iop ior ios ipd ipe ipg ipi ipo ipp ipr ips ir- ird ire irg iri iro irp irr irs is- isd ise isg isi iso isp isr iss o-i odd ode odg odi odo odp odr ods oed oee oeg oei oeo oep oer oes ogd oge ogg ogi ogo ogp ogs oid oie oii oio oip oir ois oo- ood oog ooi ooo oop oor oos op- opd ope opg opi opo opp opr ops or- ord ore org ori oro orp orr ors os- osd ose osg osi oso osp osr oss p-p pdd pde pdg pdi pdo pdp pdr pds ped pee peg pei peo pep per pes pgd pge pgg pgi pgo pgp pgr pgs pid pie pig pii pio pip pir pis pod poe pog poi poo pop por pos ppd ppe ppg ppi ppo ppp ppr pps prd pre prg pri pro prp prr prs ps- psd pse psg psi pso psp psr pss rdd rde rdg rdi rdo rdp rdr rds re- red ree reg rei reo rep rer res rgd rge rgg rgi rgo rgp rgr rgs rid rie rig rii rio rip rir ris rod roe rog roi roo rop ror ros rpd rpe rpg rpi rpo rpp rpr rps rrd rrg rri rrp rrr rrs rsd rse rsg rsi rso rsp rsr rss sdd sde sdg sdi sdo sdp sdr sds se- sed see seg sei seo sep ser ses sgd sge sgg sgi sgo sgp sgr sgs sid sie sig sii sio sip sir sis sod soe sog soi soo sop sor sos spd spe spg spi spo spp spr sps sr- srd sre srg sri sro srp srr srs ss- ssd sse ssg ssi sso ssp ssr sss