-er c-- ccc ccd cce cco ccp ccr ccs cct cdc cdd cde cdo cdp cdr cds cdt ce- cec ced cee ceo cep cer ces cet co- coc cod coe coo cop cor cos cot cpc cpd cpe cpo cpp cpr cps cpt crc crd cre cro crp crr crs crt csc csd cse cso csp csr css cst ctc ctd cte cto ctp ctr cts ctt dcc dcd dce dco dcp dcr dcs dct ddc ddd dde ddo ddp ddr dds ddt de- dec ded dee deo dep der des det doc dod doe doo dop dor dos dot dpc dpd dpe dpo dpp dpr dps dpt drc drd dre dro drp drr drs drt dsc dsd dse dso dsp dsr dss dst dtc dtd dte dto dtp dtr dts dtt ec- ecc ecd ece eco ecr ecs ect ed- edc edd ede edo edp edr eds edt eec eed eee eeo eep eer ees eet eo- eoc eod eoe eoo eop eor eos eot ep- epc epd epe epo epp epr eps ept erc erd ere ero erp err ers ert es- esc esd ese eso esp esr ess est etc etd ete eto etp etr ets ett oc- occ ocd oco ocp ocr ocs oct odc odd ode odo odp odr ods odt oec oed oee oeo oep oer oes oet oo- ooc ood ooo oop oor oos oot op- opc opd ope opo opp opr ops opt or- orc ord ore oro orp orr ors ort os- osc osd ose oso osp osr oss ost ot- otc otd ote oto otp otr ots ott p-p pcc pcd pce pco pcp pcr pcs pct pdc pdd pde pdo pdp pdr pds pdt pec ped pee peo pep per pes pet poc pod poe poo pop por pos pot ppc ppd ppe ppo ppp ppr pps ppt prc prd pre pro prp prr prs prt ps- psc psd pse pso psp psr pss pst pt- ptc ptd pte pto ptp ptr pts ptt rcc rcd rce rco rcp rcr rcs rct rdc rdd rde rdo rdp rdr rds rdt re- rec red ree reo rep rer res ret roc rod roe roo rop ror ros rot rpc rpd rpe rpo rpp rpr rps rpt rrc rrd rrp rrr rrs rrt rsc rsd rse rso rsp rsr rss rst rtc rtd rte rto rtp rtr rts rtt scc scd sce sco scp scr scs sct sdc sdd sde sdo sdp sdr sds sdt se- sec sed see seo sep ser ses set soc sod soe soo sop sor sos sot spc spd spe spo spp spr sps spt sr- src srd sre sro srp srr srs srt ss- ssc ssd sse sso ssp ssr sss sst stc std ste sto stp str sts stt tcc tcd tce tco tcp tcr tcs tct tdc tdd tde tdo tdp tdr tds tdt te- tec ted tee teo tep ter tes tet to- toc tod toe too top tor tos tot tpc tpd tpe tpo tpp tpr tps tpt trc trd tre tro trp trr trs trt tsc tsd tse tso tsp tsr tss tst ttc ttd tte tto ttp ttr tts ttt