-er a-a a-c aaa aac aae aak aam aao aar aas ac- aca acc ace ack acm aco acr acs aea aec aee aek aem aeo aer aes aka akc ake akk akm ako akr aks ama amc ame amk amm amo amr ams aoa aoc aoe aok aom aoo aor aos ar- ara arc are ark arm aro arr ars as- asa asc ase ask asm aso asr ass c-- caa cac cae cak cam cao car cas cca ccc cce cck ccm cco ccr ccs ce- cea cec cee cek cem ceo cer ces cka ckc ckm cko cks cma cmc cme cmk cmm cmo cmr cms co- coa coc coe cok com coo cor cos cra crc cre crk crm cro crr crs csa csc cse csk csm cso csr css eaa eac eae eak eam eao ear eas ec- eca ecc ece eck ecm eco ecr ecs eea eec eee eek eem eeo eer ees eka ekc eke eko ekr eks em- ema emc eme emk emm emo emr ems eo- eoa eoc eoe eok eom eoo eor eos era erc ere erk erm ero err ers es- esa esc ese esk esm eso esr ess ka- kaa kac kae kak kam kao kar kas kca kcc kce kck kcm kcr kcs ke- kea kec kee kek kem keo ker kes kkc kke kkk kkm kkr kks kma kmc kme kmk kmm kmo kms koa koc koe kok kom koo kor kos kra krc krk kro krr krs ksa ksc kse ksk ksm kso ksr kss m-o m-r maa mac mae mak mam mao mar mas mc- mca mcc mce mck mcm mco mcr mcs mea mec mee mek mem meo mer mes mka mkc mke mkk mkm mko mkr mks mma mmc mme mmk mmm mmo mmr mms moa moc moe mok mom moo mor mos mra mrc mre mrk mrm mro mrr mrs msa msc mse msk msm mso msr mss oaa oac oae oak oam oao oar oas oc- oca occ ock ocm oco ocr ocs oea oec oee oem oeo oer oes oka okc oke okk oko okr oks om- oma omc ome omm omo omr oms oo- ooa ooc ook oom ooo oor oos or- ora orc ore ork orm oro orr ors os- osa osc ose osk osm oso osr oss ra- raa rac rae rak ram rao rar ras rca rcc rce rcm rco rcr rcs re- rea rec ree rek rem reo rer res rkc rke rkk rkm rko rks rma rmc rme rmm rmo rmr rms roa roc roe rok rom roo ror ros rra rrc rrk rrm rrr rrs rsa rsc rse rsk rsm rso rsr rss saa sac sae sak sam sao sar sas sca scc sce sck scm sco scr scs se- sea sec see sek sem seo ser ses sk- ska skc ske skk skm sko skr sks sma smc sme smk smm smo smr sms soa soc soe sok som soo sor sos sr- sra src sre srk srm sro srr srs ss- ssa ssc sse ssk ssm sso ssr sss