-er c-- ccc cce ccg ccm cco ccp ccr ce- cec cee ceg cem ceo cep cer cgc cge cgg cgm cgo cgp cgr cmc cme cmg cmm cmo cmp cmr co- coc coe cog com coo cop cor cpc cpe cpg cpm cpo cpp cpr crc cre crg crm cro crp crr ec- ecc ece ecg ecm eco ecr eec eee eeg eem eeo eep eer egc ege egg egm ego egp egr em- emc eme emg emm emo emp emr eo- eoc eoe eog eom eoo eop eor ep- epc epe epg epm epo epp epr erc ere erg erm ero erp err g-p gcc gce gcg gcm gco gcp gcr ge- gec gee geg gem geo gep ger ggc ggg ggm ggo ggp ggr gmc gme gmg gmm gmo gmp gmr goc goe gog gom goo gop gor gpc gpe gpg gpm gpo gpp gpr grc gre grg grm gro grp grr m-o m-r mc- mcc mce mcg mcm mco mcp mcr mec mee meg mem meo mep mer mgc mge mgm mgo mgp mgr mmc mme mmg mmm mmo mmp mmr moc moe mog mom moo mop mor mpc mpe mpg mpm mpo mpp mpr mrc mre mrg mrm mro mrp mrr oc- occ ocg ocm oco ocp ocr oec oee oeg oem oeo oep oer ogc oge ogg ogo ogp om- omc ome omg omm omo omp omr oo- ooc oog oom ooo oop oor op- opc ope opg opm opo opp opr or- orc ore org orm oro orp orr p-p pcc pce pcg pcm pco pcp pcr pec pee peg pem peo pep per pgc pge pgg pgm pgo pgp pgr pmc pme pmg pmm pmo pmp pmr poc poe pog pom poo pop por ppc ppe ppg ppm ppo ppp ppr prc pre prg prm pro prp prr rcc rce rcg rcm rco rcp rcr re- rec ree reg rem reo rep rer rgc rge rgg rgo rgp rgr rmc rme rmg rmm rmo rmp rmr roc roe rog rom roo rop ror rpc rpe rpg rpm rpo rpp rpr rrc rrg rrm rrp rrr