-er ddd dde ddi ddo ddp ddr dds ddt de- ded dee dei deo dep der des det di- did die dii dio dip dir dis dit dod doe doi doo dop dor dos dot dpd dpe dpi dpo dpp dpr dps dpt drd dre dri dro drp drr drs drt dsd dse dsi dso dsp dsr dss dst dtd dte dti dto dtp dtr dts dtt ed- edd ede edi edo edp edr eds edt eed eee eeo eep eer ees eet eid eie eii eio eip eir eis eit eo- eod eoe eoi eoo eop eor eos eot ep- epd epe epi epo epp epr eps ept erd ere eri ero erp err ers ert es- esd ese esi eso esp esr ess est etd ete eti eto etp etr ets ett i-d idd ide idi ido idp idr ids idt ie- ied iee iei iep ier ies iet iid iie iii iio iip iir iis iit io- iod ioe ioi ioo iop ior ios iot ipd ipe ipi ipo ipp ipr ips ipt ir- ird ire iri iro irp irr irs irt is- isd ise isi iso isp isr iss ist itd ite iti ito itp its itt o-i odd ode odi odo odp odr ods odt oed oee oei oeo oep oer oes oet oid oie oii oio oip oir ois oit oo- ood ooi ooo oop oor oos oot op- opd ope opi opo opp opr ops opt or- ord ore ori oro orp orr ors ort os- osd ose osi oso osp osr oss ost ot- otd ote oti oto otp otr ots ott p-p pdd pde pdi pdo pdp pdr pds pdt ped pee pei peo pep per pes pet pid pie pii pio pip pir pis pit pod poe poi poo pop por pos pot ppd ppe ppi ppo ppp ppr pps ppt prd pre pri pro prp prr prs prt ps- psd pse psi pso psp psr pss pst pt- ptd pte pti pto ptp ptr pts ptt rdd rde rdi rdo rdp rdr rds rdt re- red ree rei reo rep rer res ret rid rie rii rio rip rir ris rit rod roe roi roo rop ror ros rot rpd rpe rpi rpo rpp rpr rps rpt rrd rri rrp rrr rrs rrt rsd rse rsi rso rsp rsr rss rst rtd rte rti rto rtp rtr rts rtt sdd sde sdi sdo sdp sdr sds sdt se- sed see sei seo sep ser ses set sid sie sii sio sip sir sis sit sod soe soi soo sop sor sos sot spd spe spi spo spp spr sps spt sr- srd sre sri sro srp srr srs srt ss- ssd sse ssi sso ssp ssr sss sst std ste sti sto stp str sts stt tdd tde tdi tdo tdp tdr tds tdt te- ted tee tei teo tep ter tes tet tid tie tii tio tip tir tis tit to- tod toe toi too top tor tos tot tpd tpe tpi tpo tpp tpr tps tpt trd tre tri tro trp trr trs trt tsd tse tsi tso tsp tsr tss tst ttd tte tti tto ttp ttr tts ttt