-er -up ddd dde ddp ddr ddt ddu de- ded dee dep der det deu dpd dpe dpp dpr dpt dpu drd dre drp drr drt dru dtd dte dtp dtr dtt dtu dud due dup dur dut ed- edd ede edp edr edt edu eed eee eep eer eet ep- epd epe epp epr ept epu erd ere erp err ert eru etd ete etp etr ett etu eu- eud eue eup eur eut p-p pdd pde pdp pdr pdt pdu ped pee pep per pet peu ppd ppe ppp ppr ppt ppu prd pre prp prr prt pru pt- ptd pte ptp ptr ptt ptu pud pue pup pur put puu rdd rde rdp rdr rdt rdu re- red ree rep rer ret reu rpd rpe rpp rpr rpt rpu rrd rrp rrr rrt rru rtd rte rtp rtr rtt rtu rud rue rup rur rut ruu tdd tde tdp tdr tdt tdu te- ted tee tep ter tet teu tpd tpe tpp tpr tpt tpu trd tre trp trr trt tru ttd tte ttp ttr ttt ttu tud tue tup tur tut tuu udd ude udp udr udt udu ued uee uep uer uet up- upd upe upp upr upt upu ur- urd ure urp urr urt uru utd ute utp utr utt utu uue uur uut uuu