-er a-a a-c aaa aac aae aaf aak aam aar aas ac- aca acc ace acf ack acm acr acs aea aec aee aef aek aem aer aes af- afa afc afe aff afk afm afr afs aka akc ake akk akm akr aks ama amc ame amf amk amm amr ams ar- ara arc are arf ark arm arr ars as- asa asc ase asf ask asm asr ass c-- caa cac cae caf cak cam car cas cca ccc cce ccf cck ccm ccr ccs ce- cea cec cee cef cek cem cer ces cfa cfc cfe cff cfk cfm cfr cfs cka ckc ckm cks cma cmc cme cmf cmk cmm cmr cms cra crc cre crf crk crm crr crs csa csc cse csf csk csm csr css eaa eac eae eaf eak eam ear eas ec- eca ecc ece ecf eck ecm ecr ecs eea eec eee eef eek eem eer ees ef- efa efc efe eff efm efr efs eka ekc eke ekf ekr eks em- ema emc eme emf emk emm emr ems era erc ere erf erk erm err ers es- esa esc ese esf esk esm esr ess faa fac fae faf fak fam far fas fca fcc fce fcf fck fcm fcr fcs fea fec fee fef fek fem fer fes ffa ffc ffe fff ffk ffm ffr ffs fka fkc fkf fkk fkm fma fmc fme fmf fmm fmr fms fra frc fre frf frk frm frr frs fsa fsc fse fsf fsk fsm fsr fss ka- kaa kac kae kaf kak kam kar kas kca kcc kce kck kcm kcr kcs ke- kea kec kee kef kek kem ker kes kfa kfc kff kfm kfs kkc kke kkk kkm kkr kks kma kmc kme kmf kmk kmm kms kra krc krf krk krr krs ksa ksc kse ksf ksk ksm ksr kss m-f m-r maa mac mae maf mak mam mar mas mc- mca mcc mce mcf mck mcm mcr mcs mea mec mee mef mek mem mer mes mfa mfc mfe mff mfm mfr mfs mka mkc mke mkk mkm mkr mks mma mmc mme mmf mmk mmm mmr mms mra mrc mre mrf mrk mrm mrr mrs msa msc mse msf msk msm msr mss ra- raa rac rae raf rak ram rar ras rca rcc rce rcf rcm rcr rcs re- rea rec ree ref rek rem rer res rfa rfc rfe rff rfk rfm rfr rfs rkc rke rkf rkk rkm rks rma rmc rme rmf rmm rmr rms rra rrc rrf rrk rrm rrr rrs rsa rsc rse rsf rsk rsm rsr rss saa sac sae saf sak sam sar sas sca scc sce scf sck scm scr scs se- sea sec see sef sek sem ser ses sfa sfc sfe sff sfk sfm sfr sfs sk- ska skc ske skf skk skm skr sks sma smc sme smf smk smm smr sms sr- sra src sre srf srk srm srr srs ss- ssa ssc sse ssf ssk ssm ssr sss