-er -up ddd dde ddo ddp ddr ddt ddu de- ded dee deo dep der det deu dod doe doo dop dor dot dou dpd dpe dpo dpp dpr dpt dpu drd dre dro drp drr drt dru dtd dte dto dtp dtr dtt dtu dud due duo dup dur dut ed- edd ede edo edp edr edt edu eed eee eeo eep eer eet eo- eod eoe eoo eop eor eot eou ep- epd epe epo epp epr ept epu erd ere ero erp err ert eru etd ete eto etp etr ett etu eu- eud eue eup eur eut odd ode odo odp odr odt odu oed oee oeo oep oer oet oo- ood ooo oop oor oot op- opd ope opo opp opr opt or- ord ore oro orp orr ort oru ot- otd ote oto otp otr ott otu ou- oud oue ouo oup our out p-p pdd pde pdo pdp pdr pdt pdu ped pee peo pep per pet peu pod poe poo pop por pot pou ppd ppe ppo ppp ppr ppt ppu prd pre pro prp prr prt pru pt- ptd pte pto ptp ptr ptt ptu pud pue pup pur put puu rdd rde rdo rdp rdr rdt rdu re- red ree reo rep rer ret reu rod roe roo rop ror rot rou rpd rpe rpo rpp rpr rpt rpu rrd rrp rrr rrt rru rtd rte rto rtp rtr rtt rtu rud rue ruo rup rur rut ruu tdd tde tdo tdp tdr tdt tdu te- ted tee teo tep ter tet teu to- tod toe too top tor tot tou tpd tpe tpo tpp tpr tpt tpu trd tre tro trp trr trt tru ttd tte tto ttp ttr ttt ttu tud tue tuo tup tur tut tuu udd ude udo udp udr udt udu ued uee uep uer uet uod uoe uoo uop uor uot up- upd upe upo upp upr upt upu ur- urd ure uro urp urr urt uru utd ute uto utp utr utt utu uue uur uut uuu