-er a-a a-c aaa aac aae aam aao aar aas ac- aca acc ace acm aco acr acs aea aec aee aem aeo aer aes ama amc ame amm amo amr ams aoa aoc aoe aom aoo aor aos ar- ara arc are arm aro arr ars as- asa asc ase asm aso asr ass c-- caa cac cae cam cao car cas cca ccc cce ccm cco ccr ccs ce- cea cec cee cem ceo cer ces cma cmc cme cmm cmo cmr cms co- coa coc coe com coo cor cos cra crc cre crm cro crr crs csa csc cse csm cso csr css eaa eac eae eam eao ear eas ec- eca ecc ece ecm eco ecr ecs eea eec eee eem eeo eer ees em- ema emc eme emm emo emr ems eo- eoa eoc eoe eom eoo eor eos era erc ere erm ero err ers es- esa esc ese esm eso esr ess m-o m-r maa mac mae mam mao mar mas mc- mca mcc mce mcm mco mcr mcs mea mec mee mem meo mer mes mma mmc mme mmm mmo mmr mms moa moc moe mom moo mor mos mra mrc mre mrm mro mrr mrs msa msc mse msm mso msr mss oaa oac oae oam oao oar oas oc- oca occ ocm oco ocr ocs oea oec oee oem oeo oer oes om- oma omc ome omm omo omr oms oo- ooa ooc oom ooo oor oos or- ora orc ore orm oro orr ors os- osa osc ose osm oso osr oss ra- raa rac rae ram rao rar ras rca rcc rce rcm rco rcr rcs re- rea rec ree rem reo rer res rma rmc rme rmm rmo rmr rms roa roc roe rom roo ror ros rra rrc rrm rrr rrs rsa rsc rse rsm rso rsr rss saa sac sae sam sao sar sas sca scc sce scm sco scr scs se- sea sec see sem seo ser ses sma smc sme smm smo smr sms soa soc soe som soo sor sos sr- sra src sre srm sro srr srs ss- ssa ssc sse ssm sso ssr sss