ddd dde ddi ddo ddp ddx de- ded dee dei deo dep dex di- did die dii dio dip dix dod doe doi doo dop dox dpd dpe dpi dpo dpp dxd dxi dxo dxp dxx ed- edd ede edi edo edp edx eed eee eeo eep eex eid eie eii eio eip eix eo- eod eoe eoi eoo eop ep- epd epe epi epo epp epx ex- exd exe exi exo exp exx i-d idd ide idi ido idp idx ie- ied iee iei iep iex iid iie iii iio iip iix io- iod ioe ioi ioo iop ipd ipe ipi ipo ipp ipx ixe ixi o-i odd ode odi odo odp oed oee oei oeo oep oex oid oie oii oio oip oo- ood ooi ooo oop oox op- opd ope opi opo opp opx ox- oxi oxo oxx p-p pdd pde pdi pdo pdp pdx ped pee pei peo pep pex pid pie pii pio pip pix pod poe poi poo pop pox ppd ppe ppi ppo ppp ppx pxe xde xdi xed xee xep xex xie xii xio xix xod xoi xoo xop xox xpd xpe xpo xpp xxi xxo xxp xxx