-er -up ddd dde ddp ddr dds ddt ddu de- ded dee dep der des det deu dpd dpe dpp dpr dps dpt dpu drd dre drp drr drs drt dru dsd dse dsp dsr dss dst dsu dtd dte dtp dtr dts dtt dtu dud due dup dur dus dut ed- edd ede edp edr eds edt edu eed eee eep eer ees eet ep- epd epe epp epr eps ept epu erd ere erp err ers ert eru es- esd ese esp esr ess est esu etd ete etp etr ets ett etu eu- eud eue eup eur eus eut p-p pdd pde pdp pdr pds pdt pdu ped pee pep per pes pet peu ppd ppe ppp ppr pps ppt ppu prd pre prp prr prs prt pru ps- psd pse psp psr pss pst psu pt- ptd pte ptp ptr pts ptt ptu pud pue pup pur pus put puu rdd rde rdp rdr rds rdt rdu re- red ree rep rer res ret reu rpd rpe rpp rpr rps rpt rpu rrd rrp rrr rrs rrt rru rsd rse rsp rsr rss rst rsu rtd rte rtp rtr rts rtt rtu rud rue rup rur rus rut ruu sdd sde sdp sdr sds sdt sdu se- sed see sep ser ses set seu spd spe spp spr sps spt spu sr- srd sre srp srr srs srt ss- ssd sse ssp ssr sss sst ssu std ste stp str sts stt stu sud sue sup sur sus sut suu tdd tde tdp tdr tds tdt tdu te- ted tee tep ter tes tet teu tpd tpe tpp tpr tps tpt tpu trd tre trp trr trs trt tru tsd tse tsp tsr tss tst tsu ttd tte ttp ttr tts ttt ttu tud tue tup tur tus tut tuu udd ude udp udr uds udt udu ued uee uep uer ues uet up- upd upe upp upr ups upt upu ur- urd ure urp urr urs urt uru usd use usp usr uss ust usu utd ute utp utr uts utt utu uue uur uus uut uuu