ddd dde ddo ddp ddx de- ded dee deo dep dex dod doe doo dop dox dpd dpe dpo dpp dxd dxo dxp dxx ed- edd ede edo edp edx eed eee eeo eep eex eo- eod eoe eoo eop ep- epd epe epo epp epx ex- exd exe exo exp exx odd ode odo odp oed oee oeo oep oex oo- ood ooo oop oox op- opd ope opo opp opx ox- oxo oxx p-p pdd pde pdo pdp pdx ped pee peo pep pex pod poe poo pop pox ppd ppe ppo ppp ppx pxe xde xed xee xep xex xod xoo xop xox xpd xpe xpo xpp xxo xxp xxx