ddd dde ddi dds ddx de- ded dee dei des dex di- did die dii dis dix dsd dse dsi dss dsx dxd dxi dxs dxx ed- edd ede edi eds edx eed eee ees eex eid eie eii eis eix es- esd ese esi ess esx ex- exd exe exi exs exx i-d idd ide idi ids idx ie- ied iee iei ies iex iid iie iii iis iix is- isd ise isi iss ixe ixi sdd sde sdi sds se- sed see sei ses sex sid sie sii sis six ss- ssd sse ssi sss ssx sxi sxs xde xdi xds xed xee xes xex xie xii xis xix xsi xss xxi xxx