-er -up ddd dde ddo ddp ddr ddu de- ded dee deo dep der deu dod doe doo dop dor dou dpd dpe dpo dpp dpr dpu drd dre dro drp drr dru dud due duo dup dur ed- edd ede edo edp edr edu eed eee eeo eep eer eo- eod eoe eoo eop eor eou ep- epd epe epo epp epr epu erd ere ero erp err eru eu- eud eue eup eur odd ode odo odp odr odu oed oee oeo oep oer oo- ood ooo oop oor op- opd ope opo opp opr or- ord ore oro orp orr oru ou- oud oue ouo oup our p-p pdd pde pdo pdp pdr pdu ped pee peo pep per peu pod poe poo pop por pou ppd ppe ppo ppp ppr ppu prd pre pro prp prr pru pud pue pup pur puu rdd rde rdo rdp rdr rdu re- red ree reo rep rer reu rod roe roo rop ror rou rpd rpe rpo rpp rpr rpu rrd rrp rrr rru rud rue ruo rup rur ruu udd ude udo udp udr udu ued uee uep uer uod uoe uoo uop uor up- upd upe upo upp upr upu ur- urd ure uro urp urr uru uue uur uuu