ddd dde ddi ddp dds ddt ddx de- ded dee dei dep des det dex di- did die dii dip dis dit dix dpd dpe dpi dpp dps dpt dsd dse dsi dsp dss dst dsx dtd dte dti dtp dts dtt dtx dxd dxi dxp dxs dxt dxx ed- edd ede edi edp eds edt edx eed eee eep ees eet eex eid eie eii eip eis eit eix ep- epd epe epi epp eps ept epx es- esd ese esi esp ess est esx etd ete eti etp ets ett etx ex- exd exe exi exp exs ext exx i-d idd ide idi idp ids idt idx ie- ied iee iei iep ies iet iex iid iie iii iip iis iit iix ipd ipe ipi ipp ips ipt ipx is- isd ise isi isp iss ist itd ite iti itp its itt itx ixe ixi p-p pdd pde pdi pdp pds pdt pdx ped pee pei pep pes pet pex pid pie pii pip pis pit pix ppd ppe ppi ppp pps ppt ppx ps- psd pse psi psp pss pst psx pt- ptd pte pti ptp pts ptt ptx pxe pxs pxt sdd sde sdi sdp sds sdt se- sed see sei sep ses set sex sid sie sii sip sis sit six spd spe spi spp sps spt spx ss- ssd sse ssi ssp sss sst ssx std ste sti stp sts stt stx sxi sxs sxt t-x tdd tde tdi tdp tds tdt tdx te- ted tee tei tep tes tet tex tid tie tii tip tis tit tix tpd tpe tpi tpp tps tpt tpx tsd tse tsi tsp tss tst tsx ttd tte tti ttp tts ttt ttx txe txi txs txt xde xdi xds xdt xed xee xep xes xet xex xie xii xis xit xix xpd xpe xpp xps xpt xsi xsp xss xst xti xtp xts xtx xxi xxp xxx