-er ddd dde ddi ddo ddr dds de- ded dee dei deo der des dev di- did die dii dio dir dis div dod doe doi doo dor dos dov drd dre dri dro drr drs drv dsd dse dsi dso dsr dss dsv dvd dve dvi dvr dvs ed- edd ede edi edo edr eds eed eee eeo eer ees eev eid eie eii eio eir eis eiv eo- eod eoe eoi eoo eor eos erd ere eri ero err ers erv es- esd ese esi eso esr ess esv evd eve evi evo evr evs evv i-d i-v idd ide idi ido idr ids idv ie- ied iee iei ier ies iev iid iie iii iio iir iis io- iod ioe ioi ioo ior ios iov ir- ird ire iri iro irr irs irv is- isd ise isi iso isr iss isv ivd ive ivi ivo ivr ivs ivv o-i odd ode odi odo odr ods odv oed oee oei oeo oer oes oid oie oii oio oir ois oiv oo- ood ooi ooo oor oos oov or- ord ore ori oro orr ors orv os- osd ose osi oso osr oss osv ov- ovd ove ovi ovo ovs ovv rdd rde rdi rdo rdr rds rdv re- red ree rei reo rer res rev rid rie rii rio rir ris riv rod roe roi roo ror ros rov rrd rri rrr rrs rsd rse rsi rso rsr rss rsv rvd rve rvi rvo rvr rvs rvv sdd sde sdi sdo sdr sds sdv se- sed see sei seo ser ses sev sid sie sii sio sir sis siv sod soe soi soo sor sos sov sr- srd sre sri sro srr srs srv ss- ssd sse ssi sso ssr sss ssv svd sve svi svo svr svs svv v-e vdd vde vdi vdo vdr vds vdv ved vee vei veo ver ves vi- vid vie vii vio vir vis viv vod voe voi voo vor vos vov vrd vre vri vrr vrs vsd vse vsi vso vsr vss vsv vvi vvo vvr vvs vvv