a-a a-c aaa aac aak aam aas ac- aca acc ack acm acs aka akc akk akm aks ama amc amk amm ams as- asa asc ask asm ass c-- caa cac cak cam cas cca ccc cck ccm ccs cka ckc ckm cks cma cmc cmk cmm cms csa csc csk csm css ka- kaa kac kak kam kas kca kcc kck kcm kcs kkc kkk kkm kks kma kmc kmk kmm kms ksa ksc ksk ksm kss maa mac mak mam mas mc- mca mcc mck mcm mcs mka mkc mkk mkm mks mma mmc mmk mmm mms msa msc msk msm mss saa sac sak sam sas sca scc sck scm scs sk- ska skc skk skm sks sma smc smk smm sms ss- ssa ssc ssk ssm sss