-er a-a a-c aaa aac aae aam aao aap aar ac- aca acc ace acm aco acp acr aea aec aee aem aeo aep aer ama amc ame amm amo amp amr aoa aoc aoe aom aoo aop aor ap- apa apc ape apm apo app apr ar- ara arc are arm aro arp arr c-- caa cac cae cam cao cap car cca ccc cce ccm cco ccp ccr ce- cea cec cee cem ceo cep cer cma cmc cme cmm cmo cmp cmr co- coa coc coe com coo cop cor cpa cpc cpe cpm cpo cpp cpr cra crc cre crm cro crp crr eaa eac eae eam eao eap ear ec- eca ecc ece ecm eco ecr eea eec eee eem eeo eep eer em- ema emc eme emm emo emp emr eo- eoa eoc eoe eom eoo eop eor ep- epa epc epe epm epo epp epr era erc ere erm ero erp err m-o m-r maa mac mae mam mao map mar mc- mca mcc mce mcm mco mcp mcr mea mec mee mem meo mep mer mma mmc mme mmm mmo mmp mmr moa moc moe mom moo mop mor mpa mpc mpe mpm mpo mpp mpr mra mrc mre mrm mro mrp mrr oaa oac oae oam oao oap oar oc- oca occ ocm oco ocp ocr oea oec oee oem oeo oep oer om- oma omc ome omm omo omp omr oo- ooa ooc oom ooo oop oor op- opa opc ope opm opo opp opr or- ora orc ore orm oro orp orr p-p paa pac pae pam pao pap par pca pcc pce pcm pco pcp pcr pea pec pee pem peo pep per pma pmc pme pmm pmo pmp pmr poa poc poe pom poo pop por ppa ppc ppe ppm ppo ppp ppr pra prc pre prm pro prp prr ra- raa rac rae ram rao rap rar rca rcc rce rcm rco rcp rcr re- rea rec ree rem reo rep rer rma rmc rme rmm rmo rmp rmr roa roc roe rom roo rop ror rpa rpc rpe rpm rpo rpp rpr rra rrc rrm rrp rrr