ddd dde ddo dds ddx de- ded dee deo des dex dod doe doo dos dox dsd dse dso dss dsx dxd dxo dxs dxx ed- edd ede edo eds edx eed eee eeo ees eex eo- eod eoe eoo eos es- esd ese eso ess esx ex- exd exe exo exs exx odd ode odo ods oed oee oeo oes oex oo- ood ooo oos oox os- osd ose oso oss osx ox- oxo oxx sdd sde sdo sds se- sed see seo ses sex sod soe soo sos sox ss- ssd sse sso sss ssx sxs xde xds xed xee xes xex xod xoo xos xox xss xxo xxx