-er c-- ccc ccd cce cco ccp ccr cct cdc cdd cde cdo cdp cdr cdt ce- cec ced cee ceo cep cer cet co- coc cod coe coo cop cor cot cpc cpd cpe cpo cpp cpr cpt crc crd cre cro crp crr crt ctc ctd cte cto ctp ctr ctt dcc dcd dce dco dcp dcr dct ddc ddd dde ddo ddp ddr ddt de- dec ded dee deo dep der det doc dod doe doo dop dor dot dpc dpd dpe dpo dpp dpr dpt drc drd dre dro drp drr drt dtc dtd dte dto dtp dtr dtt ec- ecc ecd ece eco ecr ect ed- edc edd ede edo edp edr edt eec eed eee eeo eep eer eet eo- eoc eod eoe eoo eop eor eot ep- epc epd epe epo epp epr ept erc erd ere ero erp err ert etc etd ete eto etp etr ett oc- occ ocd oco ocp ocr oct odc odd ode odo odp odr odt oec oed oee oeo oep oer oet oo- ooc ood ooo oop oor oot op- opc opd ope opo opp opr opt or- orc ord ore oro orp orr ort ot- otc otd ote oto otp otr ott p-p pcc pcd pce pco pcp pcr pct pdc pdd pde pdo pdp pdr pdt pec ped pee peo pep per pet poc pod poe poo pop por pot ppc ppd ppe ppo ppp ppr ppt prc prd pre pro prp prr prt pt- ptc ptd pte pto ptp ptr ptt rcc rcd rce rco rcp rcr rct rdc rdd rde rdo rdp rdr rdt re- rec red ree reo rep rer ret roc rod roe roo rop ror rot rpc rpd rpe rpo rpp rpr rpt rrc rrd rrp rrr rrt rtc rtd rte rto rtp rtr rtt tcc tcd tce tco tcp tcr tct tdc tdd tde tdo tdp tdr tdt te- tec ted tee teo tep ter tet to- toc tod toe too top tor tot tpc tpd tpe tpo tpp tpr tpt trc trd tre tro trp trr trt ttc ttd tte tto ttp ttr ttt