-er c-- ccc cce ccm cco ccp ccr ccz ce- cec cee cem ceo cep cer cez cmc cme cmm cmo cmp cmr co- coc coe com coo cop cor coz cpc cpe cpm cpo cpp cpr cpz crc cre crm cro crp crr crz cz- czc cze czm czo ec- ecc ece ecm eco ecr eec eee eem eeo eep eer em- emc eme emm emo emp emr eo- eoc eoe eom eoo eop eor ep- epc epe epm epo epp epr epz erc ere erm ero erp err erz eze ezo ezr ezz m-o m-r mc- mcc mce mcm mco mcp mcr mcz mec mee mem meo mep mer mez mmc mme mmm mmo mmp mmr mmz moc moe mom moo mop mor moz mpc mpe mpm mpo mpp mpr mrc mre mrm mro mrp mrr mrz mzm mzp oc- occ ocm oco ocp ocr ocz oec oee oem oeo oep oer om- omc ome omm omo omp omr omz oo- ooc oom ooo oop oor op- opc ope opm opo opp opr or- orc ore orm oro orp orr orz oze ozm ozo ozz p-p pcc pce pcm pco pcp pcr pec pee pem peo pep per pez pmc pme pmm pmo pmp pmr pmz poc poe pom poo pop por poz ppc ppe ppm ppo ppp ppr ppz prc pre prm pro prp prr prz pzc pzm pzp rcc rce rcm rco rcp rcr re- rec ree rem reo rep rer rez rmc rme rmm rmo rmp rmr roc roe rom roo rop ror roz rpc rpe rpm rpo rpp rpr rpz rrc rrm rrp rrr rze rzm rzo zce zco zec zee zem zeo zep zer zez zmc zmm zmp zo- zoc zoe zom zoo zor zpc zpe zpm zpo zpp zpr zro zrp zzr zzz