a-a a-c aaa aac aae aak aam aas ac- aca acc ace ack acm acs aea aec aee aek aem aes aka akc ake akk akm aks ama amc ame amk amm ams as- asa asc ase ask asm ass c-- caa cac cae cak cam cas cca ccc cce cck ccm ccs ce- cea cec cee cek cem ces cka ckc ckm cks cma cmc cme cmk cmm cms csa csc cse csk csm css eaa eac eae eak eam eas ec- eca ecc ece eck ecm ecs eea eec eee eek eem ees eka ekc eke eks em- ema emc eme emk emm ems es- esa esc ese esk esm ess ka- kaa kac kae kak kam kas kca kcc kce kck kcm kcs ke- kea kec kee kek kem kes kkc kke kkk kkm kks kma kmc kme kmk kmm kms ksa ksc kse ksk ksm kss maa mac mae mak mam mas mc- mca mcc mce mck mcm mcs mea mec mee mek mem mes mka mkc mke mkk mkm mks mma mmc mme mmk mmm mms msa msc mse msk msm mss saa sac sae sak sam sas sca scc sce sck scm scs se- sea sec see sek sem ses sk- ska skc ske skk skm sks sma smc sme smk smm sms ss- ssa ssc sse ssk ssm sss