-er c-- ccc cce ccf ccm cco ccp ccr ce- cec cee cef cem ceo cep cer cfc cfe cff cfm cfo cfp cfr cmc cme cmf cmm cmo cmp cmr co- coc coe cof com coo cop cor cpc cpe cpf cpm cpo cpp cpr crc cre crf crm cro crp crr ec- ecc ece ecf ecm eco ecr eec eee eef eem eeo eep eer ef- efc efe eff efm efo efp efr em- emc eme emf emm emo emp emr eo- eoc eoe eof eom eoo eop eor ep- epc epe epf epm epo epp epr erc ere erf erm ero erp err fcc fce fcf fcm fco fcp fcr fec fee fef fem feo fep fer ffc ffe fff ffm ffo ffp ffr fmc fme fmf fmm fmo fmp fmr foc foe fof fom foo fop for fpc fpe fpm fpo fpp fpr frc fre frf frm fro frp frr m-f m-o m-r mc- mcc mce mcf mcm mco mcp mcr mec mee mef mem meo mep mer mfc mfe mff mfm mfo mfp mfr mmc mme mmf mmm mmo mmp mmr moc moe mof mom moo mop mor mpc mpe mpf mpm mpo mpp mpr mrc mre mrf mrm mro mrp mrr oc- occ ocf ocm oco ocp ocr oec oee oef oem oeo oep oer of- ofc ofe off ofm ofo ofp ofr om- omc ome omf omm omo omp omr oo- ooc oof oom ooo oop oor op- opc ope opf opm opo opp opr or- orc ore orf orm oro orp orr p-p pcc pce pcf pcm pco pcp pcr pec pee pef pem peo pep per pfc pfe pff pfm pfo pfp pfr pmc pme pmf pmm pmo pmp pmr poc poe pof pom poo pop por ppc ppe ppf ppm ppo ppp ppr prc pre prf prm pro prp prr rcc rce rcf rcm rco rcp rcr re- rec ree ref rem reo rep rer rfc rfe rff rfm rfo rfp rfr rmc rme rmf rmm rmo rmp rmr roc roe rof rom roo rop ror rpc rpe rpf rpm rpo rpp rpr rrc rrf rrm rrp rrr