-er a-a a-c aaa aac aae aaf aak aam aao aar aas ac- aca acc ace acf ack acm aco acr acs aea aec aee aef aek aem aeo aer aes af- afa afc afe aff afk afm afo afr afs aka akc ake akk akm ako akr aks ama amc ame amf amk amm amo amr ams aoa aoc aoe aof aok aom aoo aor aos ar- ara arc are arf ark arm aro arr ars as- asa asc ase asf ask asm aso asr ass c-- caa cac cae caf cak cam cao car cas cca ccc cce ccf cck ccm cco ccr ccs ce- cea cec cee cef cek cem ceo cer ces cfa cfc cfe cff cfk cfm cfo cfr cfs cka ckc ckm cko cks cma cmc cme cmf cmk cmm cmo cmr cms co- coa coc coe cof cok com coo cor cos cra crc cre crf crk crm cro crr crs csa csc cse csf csk csm cso csr css eaa eac eae eaf eak eam eao ear eas ec- eca ecc ece ecf eck ecm eco ecr ecs eea eec eee eef eek eem eeo eer ees ef- efa efc efe eff efm efo efr efs eka ekc eke ekf eko ekr eks em- ema emc eme emf emk emm emo emr ems eo- eoa eoc eoe eof eok eom eoo eor eos era erc ere erf erk erm ero err ers es- esa esc ese esf esk esm eso esr ess faa fac fae faf fak fam fao far fas fca fcc fce fcf fck fcm fco fcr fcs fea fec fee fef fek fem feo fer fes ffa ffc ffe fff ffk ffm ffo ffr ffs fka fkc fkf fkk fkm fma fmc fme fmf fmm fmo fmr fms foa foc foe fof fok fom foo for fos fra frc fre frf frk frm fro frr frs fsa fsc fse fsf fsk fsm fso fsr fss ka- kaa kac kae kaf kak kam kao kar kas kca kcc kce kck kcm kcr kcs ke- kea kec kee kef kek kem keo ker kes kfa kfc kff kfm kfo kfs kkc kke kkk kkm kkr kks kma kmc kme kmf kmk kmm kmo kms koa koc koe kof kok kom koo kor kos kra krc krf krk kro krr krs ksa ksc kse ksf ksk ksm kso ksr kss m-f m-o m-r maa mac mae maf mak mam mao mar mas mc- mca mcc mce mcf mck mcm mco mcr mcs mea mec mee mef mek mem meo mer mes mfa mfc mfe mff mfm mfo mfr mfs mka mkc mke mkk mkm mko mkr mks mma mmc mme mmf mmk mmm mmo mmr mms moa moc moe mof mok mom moo mor mos mra mrc mre mrf mrk mrm mro mrr mrs msa msc mse msf msk msm mso msr mss oaa oac oae oaf oak oam oao oar oas oc- oca occ ocf ock ocm oco ocr ocs oea oec oee oef oem oeo oer oes of- ofa ofc ofe off ofm ofo ofr ofs oka okc oke okk oko okr oks om- oma omc ome omf omm omo omr oms oo- ooa ooc oof ook oom ooo oor oos or- ora orc ore orf ork orm oro orr ors os- osa osc ose osf osk osm oso osr oss ra- raa rac rae raf rak ram rao rar ras rca rcc rce rcf rcm rco rcr rcs re- rea rec ree ref rek rem reo rer res rfa rfc rfe rff rfk rfm rfo rfr rfs rkc rke rkf rkk rkm rko rks rma rmc rme rmf rmm rmo rmr rms roa roc roe rof rok rom roo ror ros rra rrc rrf rrk rrm rrr rrs rsa rsc rse rsf rsk rsm rso rsr rss saa sac sae saf sak sam sao sar sas sca scc sce scf sck scm sco scr scs se- sea sec see sef sek sem seo ser ses sfa sfc sfe sff sfk sfm sfo sfr sfs sk- ska skc ske skf skk skm sko skr sks sma smc sme smf smk smm smo smr sms soa soc soe sof sok som soo sor sos sr- sra src sre srf srk srm sro srr srs ss- ssa ssc sse ssf ssk ssm sso ssr sss