a-a a-c a-z aaa aac aaf aak aas aaz ac- aca acc acf ack acs acz af- afa afc aff afk afs afz aka akc akk aks as- asa asc asf ask ass asz az- aza azf azs azz c-- caa cac caf cak cas caz cca ccc ccf cck ccs ccz cfa cfc cff cfk cfs cfz cka ckc cks csa csc csf csk css csz cz- czc czk faa fac faf fak fas faz fca fcc fcf fck fcs fcz ffa ffc fff ffk ffs ffz fka fkc fkf fkk fsa fsc fsf fsk fss k-z ka- kaa kac kaf kak kas kaz kca kcc kck kcs kfa kfc kff kfs kkc kkk kks ksa ksc ksf ksk kss saa sac saf sak sas saz sca scc scf sck scs sfa sfc sff sfk sfs sfz sk- ska skc skf skk sks ss- ssa ssc ssf ssk sss ssz sza zaa zac zaf zak zas zaz zcs zfa zfc zfs zka zks zsa zsz zzs zzz