-er ddd dde ddi ddo ddp ddr dds ddt ddx de- ded dee dei deo dep der des det dex di- did die dii dio dip dir dis dit dix dod doe doi doo dop dor dos dot dox dpd dpe dpi dpo dpp dpr dps dpt drd dre dri dro drp drr drs drt drx dsd dse dsi dso dsp dsr dss dst dsx dtd dte dti dto dtp dtr dts dtt dtx dxd dxi dxo dxp dxr dxs dxt dxx ed- edd ede edi edo edp edr eds edt edx eed eee eeo eep eer ees eet eex eid eie eii eio eip eir eis eit eix eo- eod eoe eoi eoo eop eor eos eot ep- epd epe epi epo epp epr eps ept epx erd ere eri ero erp err ers ert es- esd ese esi eso esp esr ess est esx etd ete eti eto etp etr ets ett etx ex- exd exe exi exo exp exr exs ext exx i-d idd ide idi ido idp idr ids idt idx ie- ied iee iei iep ier ies iet iex iid iie iii iio iip iir iis iit iix io- iod ioe ioi ioo iop ior ios iot ipd ipe ipi ipo ipp ipr ips ipt ipx ir- ird ire iri iro irp irr irs irt irx is- isd ise isi iso isp isr iss ist itd ite iti ito itp its itt itx ixe ixi o-i odd ode odi odo odp odr ods odt oed oee oei oeo oep oer oes oet oex oid oie oii oio oip oir ois oit oo- ood ooi ooo oop oor oos oot oox op- opd ope opi opo opp opr ops opt opx or- ord ore ori oro orp orr ors ort orx os- osd ose osi oso osp osr oss ost osx ot- otd ote oti oto otp otr ots ott ox- oxi oxo oxt oxx p-p pdd pde pdi pdo pdp pdr pds pdt pdx ped pee pei peo pep per pes pet pex pid pie pii pio pip pir pis pit pix pod poe poi poo pop por pos pot pox ppd ppe ppi ppo ppp ppr pps ppt ppx prd pre pri pro prp prr prs prt prx ps- psd pse psi pso psp psr pss pst psx pt- ptd pte pti pto ptp ptr pts ptt ptx pxe pxr pxs pxt rdd rde rdi rdo rdp rdr rds rdt rdx re- red ree rei reo rep rer res ret rex rid rie rii rio rip rir ris rit rix rod roe roi roo rop ror ros rot rox rpd rpe rpi rpo rpp rpr rps rpt rpx rrd rri rrp rrr rrs rrt rsd rse rsi rso rsp rsr rss rst rsx rtd rte rti rto rtp rtr rts rtt rtx rxp rxr rxs sdd sde sdi sdo sdp sdr sds sdt se- sed see sei seo sep ser ses set sex sid sie sii sio sip sir sis sit six sod soe soi soo sop sor sos sot sox spd spe spi spo spp spr sps spt spx sr- srd sre sri sro srp srr srs srt srx ss- ssd sse ssi sso ssp ssr sss sst ssx std ste sti sto stp str sts stt stx sxi sxs sxt t-x tdd tde tdi tdo tdp tdr tds tdt tdx te- ted tee tei teo tep ter tes tet tex tid tie tii tio tip tir tis tit tix to- tod toe toi too top tor tos tot tox tpd tpe tpi tpo tpp tpr tps tpt tpx trd tre tri tro trp trr trs trt trx tsd tse tsi tso tsp tsr tss tst tsx ttd tte tti tto ttp ttr tts ttt ttx txe txi txs txt xde xdi xdr xds xdt xed xee xep xer xes xet xex xie xii xio xis xit xix xod xoi xoo xop xor xos xot xox xpd xpe xpo xpp xps xpt xrd xrt xrx xsi xsp xss xst xti xtp xtr xts xtx xxi xxo xxp xxx