-er -up ddd dde ddo ddp ddr dds ddt ddu de- ded dee deo dep der des det deu dod doe doo dop dor dos dot dou dpd dpe dpo dpp dpr dps dpt dpu drd dre dro drp drr drs drt dru dsd dse dso dsp dsr dss dst dsu dtd dte dto dtp dtr dts dtt dtu dud due duo dup dur dus dut ed- edd ede edo edp edr eds edt edu eed eee eeo eep eer ees eet eo- eod eoe eoo eop eor eos eot eou ep- epd epe epo epp epr eps ept epu erd ere ero erp err ers ert eru es- esd ese eso esp esr ess est esu etd ete eto etp etr ets ett etu eu- eud eue eup eur eus eut odd ode odo odp odr ods odt odu oed oee oeo oep oer oes oet oo- ood ooo oop oor oos oot op- opd ope opo opp opr ops opt or- ord ore oro orp orr ors ort oru os- osd ose oso osp osr oss ost osu ot- otd ote oto otp otr ots ott otu ou- oud oue ouo oup our ous out p-p pdd pde pdo pdp pdr pds pdt pdu ped pee peo pep per pes pet peu pod poe poo pop por pos pot pou ppd ppe ppo ppp ppr pps ppt ppu prd pre pro prp prr prs prt pru ps- psd pse pso psp psr pss pst psu pt- ptd pte pto ptp ptr pts ptt ptu pud pue pup pur pus put puu rdd rde rdo rdp rdr rds rdt rdu re- red ree reo rep rer res ret reu rod roe roo rop ror ros rot rou rpd rpe rpo rpp rpr rps rpt rpu rrd rrp rrr rrs rrt rru rsd rse rso rsp rsr rss rst rsu rtd rte rto rtp rtr rts rtt rtu rud rue ruo rup rur rus rut ruu sdd sde sdo sdp sdr sds sdt sdu se- sed see seo sep ser ses set seu sod soe soo sop sor sos sot sou spd spe spo spp spr sps spt spu sr- srd sre sro srp srr srs srt ss- ssd sse sso ssp ssr sss sst ssu std ste sto stp str sts stt stu sud sue suo sup sur sus sut suu tdd tde tdo tdp tdr tds tdt tdu te- ted tee teo tep ter tes tet teu to- tod toe too top tor tos tot tou tpd tpe tpo tpp tpr tps tpt tpu trd tre tro trp trr trs trt tru tsd tse tso tsp tsr tss tst tsu ttd tte tto ttp ttr tts ttt ttu tud tue tuo tup tur tus tut tuu udd ude udo udp udr uds udt udu ued uee uep uer ues uet uod uoe uoo uop uor uos uot up- upd upe upo upp upr ups upt upu ur- urd ure uro urp urr urs urt uru usd use uso usp usr uss ust usu utd ute uto utp utr uts utt utu uue uur uus uut uuu