ddd dde ddi ddo ddp de- ded dee dei deo dep di- did die dii dio dip dod doe doi doo dop dpd dpe dpi dpo dpp ed- edd ede edi edo edp eed eee eeo eep eid eie eii eio eip eo- eod eoe eoi eoo eop ep- epd epe epi epo epp i-d idd ide idi ido idp ie- ied iee iei iep iid iie iii iio iip io- iod ioe ioi ioo iop ipd ipe ipi ipo ipp o-i odd ode odi odo odp oed oee oei oeo oep oid oie oii oio oip oo- ood ooi ooo oop op- opd ope opi opo opp p-p pdd pde pdi pdo pdp ped pee pei peo pep pid pie pii pio pip pod poe poi poo pop ppd ppe ppi ppo ppp