ddd dde ddi ddo ddp dds ddt ddx de- ded dee dei deo dep des det dex di- did die dii dio dip dis dit dix dod doe doi doo dop dos dot dox dpd dpe dpi dpo dpp dps dpt dsd dse dsi dso dsp dss dst dsx dtd dte dti dto dtp dts dtt dtx dxd dxi dxo dxp dxs dxt dxx ed- edd ede edi edo edp eds edt edx eed eee eeo eep ees eet eex eid eie eii eio eip eis eit eix eo- eod eoe eoi eoo eop eos eot ep- epd epe epi epo epp eps ept epx es- esd ese esi eso esp ess est esx etd ete eti eto etp ets ett etx ex- exd exe exi exo exp exs ext exx i-d idd ide idi ido idp ids idt idx ie- ied iee iei iep ies iet iex iid iie iii iio iip iis iit iix io- iod ioe ioi ioo iop ios iot ipd ipe ipi ipo ipp ips ipt ipx is- isd ise isi iso isp iss ist itd ite iti ito itp its itt itx ixe ixi o-i odd ode odi odo odp ods odt oed oee oei oeo oep oes oet oex oid oie oii oio oip ois oit oo- ood ooi ooo oop oos oot oox op- opd ope opi opo opp ops opt opx os- osd ose osi oso osp oss ost osx ot- otd ote oti oto otp ots ott ox- oxi oxo oxt oxx p-p pdd pde pdi pdo pdp pds pdt pdx ped pee pei peo pep pes pet pex pid pie pii pio pip pis pit pix pod poe poi poo pop pos pot pox ppd ppe ppi ppo ppp pps ppt ppx ps- psd pse psi pso psp pss pst psx pt- ptd pte pti pto ptp pts ptt ptx pxe pxs pxt sdd sde sdi sdo sdp sds sdt se- sed see sei seo sep ses set sex sid sie sii sio sip sis sit six sod soe soi soo sop sos sot sox spd spe spi spo spp sps spt spx ss- ssd sse ssi sso ssp sss sst ssx std ste sti sto stp sts stt stx sxi sxs sxt t-x tdd tde tdi tdo tdp tds tdt tdx te- ted tee tei teo tep tes tet tex tid tie tii tio tip tis tit tix to- tod toe toi too top tos tot tox tpd tpe tpi tpo tpp tps tpt tpx tsd tse tsi tso tsp tss tst tsx ttd tte tti tto ttp tts ttt ttx txe txi txs txt xde xdi xds xdt xed xee xep xes xet xex xie xii xio xis xit xix xod xoi xoo xop xos xot xox xpd xpe xpo xpp xps xpt xsi xsp xss xst xti xtp xts xtx xxi xxo xxp xxx