-er -up ddd dde ddo ddp ddr dds ddu de- ded dee deo dep der des deu dod doe doo dop dor dos dou dpd dpe dpo dpp dpr dps dpu drd dre dro drp drr drs dru dsd dse dso dsp dsr dss dsu dud due duo dup dur dus ed- edd ede edo edp edr eds edu eed eee eeo eep eer ees eo- eod eoe eoo eop eor eos eou ep- epd epe epo epp epr eps epu erd ere ero erp err ers eru es- esd ese eso esp esr ess esu eu- eud eue eup eur eus odd ode odo odp odr ods odu oed oee oeo oep oer oes oo- ood ooo oop oor oos op- opd ope opo opp opr ops or- ord ore oro orp orr ors oru os- osd ose oso osp osr oss osu ou- oud oue ouo oup our ous p-p pdd pde pdo pdp pdr pds pdu ped pee peo pep per pes peu pod poe poo pop por pos pou ppd ppe ppo ppp ppr pps ppu prd pre pro prp prr prs pru ps- psd pse pso psp psr pss psu pud pue pup pur pus puu rdd rde rdo rdp rdr rds rdu re- red ree reo rep rer res reu rod roe roo rop ror ros rou rpd rpe rpo rpp rpr rps rpu rrd rrp rrr rrs rru rsd rse rso rsp rsr rss rsu rud rue ruo rup rur rus ruu sdd sde sdo sdp sdr sds sdu se- sed see seo sep ser ses seu sod soe soo sop sor sos sou spd spe spo spp spr sps spu sr- srd sre sro srp srr srs ss- ssd sse sso ssp ssr sss ssu sud sue suo sup sur sus suu udd ude udo udp udr uds udu ued uee uep uer ues uod uoe uoo uop uor uos up- upd upe upo upp upr ups upu ur- urd ure uro urp urr urs uru usd use uso usp usr uss usu uue uur uus uuu