ddd dde ddo ddp dds ddx de- ded dee deo dep des dex dod doe doo dop dos dox dpd dpe dpo dpp dps dsd dse dso dsp dss dsx dxd dxo dxp dxs dxx ed- edd ede edo edp eds edx eed eee eeo eep ees eex eo- eod eoe eoo eop eos ep- epd epe epo epp eps epx es- esd ese eso esp ess esx ex- exd exe exo exp exs exx odd ode odo odp ods oed oee oeo oep oes oex oo- ood ooo oop oos oox op- opd ope opo opp ops opx os- osd ose oso osp oss osx ox- oxo oxx p-p pdd pde pdo pdp pds pdx ped pee peo pep pes pex pod poe poo pop pos pox ppd ppe ppo ppp pps ppx ps- psd pse pso psp pss psx pxe pxs sdd sde sdo sdp sds se- sed see seo sep ses sex sod soe soo sop sos sox spd spe spo spp sps spx ss- ssd sse sso ssp sss ssx sxs xde xds xed xee xep xes xex xod xoo xop xos xox xpd xpe xpo xpp xps xsp xss xxo xxp xxx