-er a-a a-c aaa aac aae aam aao aap aar aas ac- aca acc ace acm aco acp acr acs aea aec aee aem aeo aep aer aes ama amc ame amm amo amp amr ams aoa aoc aoe aom aoo aop aor aos ap- apa apc ape apm apo app apr aps ar- ara arc are arm aro arp arr ars as- asa asc ase asm aso asp asr ass c-- caa cac cae cam cao cap car cas cca ccc cce ccm cco ccp ccr ccs ce- cea cec cee cem ceo cep cer ces cma cmc cme cmm cmo cmp cmr cms co- coa coc coe com coo cop cor cos cpa cpc cpe cpm cpo cpp cpr cps cra crc cre crm cro crp crr crs csa csc cse csm cso csp csr css eaa eac eae eam eao eap ear eas ec- eca ecc ece ecm eco ecr ecs eea eec eee eem eeo eep eer ees em- ema emc eme emm emo emp emr ems eo- eoa eoc eoe eom eoo eop eor eos ep- epa epc epe epm epo epp epr eps era erc ere erm ero erp err ers es- esa esc ese esm eso esp esr ess m-o m-r maa mac mae mam mao map mar mas mc- mca mcc mce mcm mco mcp mcr mcs mea mec mee mem meo mep mer mes mma mmc mme mmm mmo mmp mmr mms moa moc moe mom moo mop mor mos mpa mpc mpe mpm mpo mpp mpr mps mra mrc mre mrm mro mrp mrr mrs msa msc mse msm mso msp msr mss oaa oac oae oam oao oap oar oas oc- oca occ ocm oco ocp ocr ocs oea oec oee oem oeo oep oer oes om- oma omc ome omm omo omp omr oms oo- ooa ooc oom ooo oop oor oos op- opa opc ope opm opo opp opr ops or- ora orc ore orm oro orp orr ors os- osa osc ose osm oso osp osr oss p-p paa pac pae pam pao pap par pas pca pcc pce pcm pco pcp pcr pcs pea pec pee pem peo pep per pes pma pmc pme pmm pmo pmp pmr pms poa poc poe pom poo pop por pos ppa ppc ppe ppm ppo ppp ppr pps pra prc pre prm pro prp prr prs ps- psa psc pse psm pso psp psr pss ra- raa rac rae ram rao rap rar ras rca rcc rce rcm rco rcp rcr rcs re- rea rec ree rem reo rep rer res rma rmc rme rmm rmo rmp rmr rms roa roc roe rom roo rop ror ros rpa rpc rpe rpm rpo rpp rpr rps rra rrc rrm rrp rrr rrs rsa rsc rse rsm rso rsp rsr rss saa sac sae sam sao sap sar sas sca scc sce scm sco scp scr scs se- sea sec see sem seo sep ser ses sma smc sme smm smo smp smr sms soa soc soe som soo sop sor sos spa spc spe spm spo spp spr sps sr- sra src sre srm sro srp srr srs ss- ssa ssc sse ssm sso ssp ssr sss