-er ddd dde ddi ddr dds ddt ddu ddx de- ded dee dei der des det deu dex di- did die dii dir dis dit diu dix drd dre dri drr drs drt dru drx dsd dse dsi dsr dss dst dsu dsx dtd dte dti dtr dts dtt dtu dtx dud due dui dur dus dut dux dxd dxi dxr dxs dxt dxx ed- edd ede edi edr eds edt edu edx eed eee eer ees eet eex eid eie eii eir eis eit eiu eix erd ere eri err ers ert eru es- esd ese esi esr ess est esu esx etd ete eti etr ets ett etu etx eu- eud eue eui eur eus eut eux ex- exd exe exi exr exs ext exu exx i-d idd ide idi idr ids idt idu idx ie- ied iee iei ier ies iet iex iid iie iii iir iis iit iiu iix ir- ird ire iri irr irs irt iru irx is- isd ise isi isr iss ist isu itd ite iti its itt itu itx iu- iud iue iui iur ius iut ixe ixi rdd rde rdi rdr rds rdt rdu rdx re- red ree rei rer res ret reu rex rid rie rii rir ris rit rix rrd rri rrr rrs rrt rru rsd rse rsi rsr rss rst rsu rsx rtd rte rti rtr rts rtt rtu rtx rud rue rui rur rus rut ruu rux rxr rxs sdd sde sdi sdr sds sdt sdu se- sed see sei ser ses set seu sex sid sie sii sir sis sit siu six sr- srd sre sri srr srs srt srx ss- ssd sse ssi ssr sss sst ssu ssx std ste sti str sts stt stu stx sud sue sui sur sus sut suu sux sxi sxs sxt sxu t-x tdd tde tdi tdr tds tdt tdu tdx te- ted tee tei ter tes tet teu tex tid tie tii tir tis tit tiu tix trd tre tri trr trs trt tru trx tsd tse tsi tsr tss tst tsu tsx ttd tte tti ttr tts ttt ttu ttx tud tue tui tur tus tut tuu tux txe txi txs txt txu udd ude udi udr uds udt udu udx ued uee uei uer ues uet uid uie uii uir uis uit uiu ur- urd ure uri urr urs urt uru urx usd use usi usr uss ust usu usx utd ute uti utr uts utt utu utx uue uur uus uut uuu uxr uxt uxu xde xdi xdr xds xdt xed xee xer xes xet xeu xex xie xii xis xit xiu xix xrd xrt xrx xsi xss xst xti xtr xts xtx xue xui xus xxi xxx