-er c-- ccc ccd cce ccf cco ccp ccr cdc cdd cde cdf cdo cdp cdr ce- cec ced cee cef ceo cep cer cfc cfd cfe cff cfo cfp cfr co- coc cod coe cof coo cop cor cpc cpd cpe cpf cpo cpp cpr crc crd cre crf cro crp crr dcc dcd dce dcf dco dcp dcr ddc ddd dde ddf ddo ddp ddr de- dec ded dee def deo dep der dfc dfd dfe dff dfo dfp dfr doc dod doe dof doo dop dor dpc dpd dpe dpf dpo dpp dpr drc drd dre dro drp drr ec- ecc ecd ece ecf eco ecr ed- edc edd ede edf edo edp edr eec eed eee eef eeo eep eer ef- efc efd efe eff efo efp efr eo- eoc eod eoe eof eoo eop eor ep- epc epd epe epf epo epp epr erc erd ere erf ero erp err fcc fcd fce fcf fco fcp fcr fdc fdd fde fdf fdo fdp fdr fec fed fee fef feo fep fer ffc ffd ffe fff ffo ffp ffr foc foe fof foo fop for fpc fpd fpe fpo fpp fpr frc frd fre frf fro frp frr oc- occ ocd ocf oco ocp ocr odc odd ode odf odo odp odr oec oed oee oef oeo oep oer of- ofc ofd ofe off ofo ofp ofr oo- ooc ood oof ooo oop oor op- opc opd ope opf opo opp opr or- orc ord ore orf oro orp orr p-p pcc pcd pce pcf pco pcp pcr pdc pdd pde pdf pdo pdp pdr pec ped pee pef peo pep per pfc pfd pfe pff pfo pfp pfr poc pod poe pof poo pop por ppc ppd ppe ppf ppo ppp ppr prc prd pre prf pro prp prr rcc rcd rce rcf rco rcp rcr rdc rdd rde rdf rdo rdp rdr re- rec red ree ref reo rep rer rfc rfd rfe rff rfo rfp rfr roc rod roe rof roo rop ror rpc rpd rpe rpf rpo rpp rpr rrc rrd rrf rrp rrr