a-a a-c aaa aac aaf aak aas aau ac- aca acc acf ack acs acu af- afa afc aff afk afs afu aka akc akk aks aku as- asa asc asf ask ass asu au- aua auc auf auk aus c-- caa cac caf cak cas cau cca ccc ccf cck ccs ccu cfa cfc cff cfk cfs cfu cka ckc cks csa csc csf csk css csu cua cuc cuf cuk cus cuu faa fac faf fak fas fau fca fcc fcf fck fcs fcu ffa ffc fff ffk ffs ffu fka fkc fkf fkk fsa fsc fsf fsk fss fsu fua fuf fuk fus fuu ka- kaa kac kaf kak kas kau kca kcc kck kcs kcu kfa kfc kff kfs kfu kkc kkk kks kku ksa ksc ksf ksk kss ksu kuc kuk kus kuu saa sac saf sak sas sau sca scc scf sck scs scu sfa sfc sff sfk sfs sfu sk- ska skc skf skk sks sku ss- ssa ssc ssf ssk sss ssu sua suc suf suk sus suu ua- uaa uac uaf uak uas uau uca ucc ucf uck ucs ucu ufa ufc uff ufs ufu uka ukc ukf ukk uku usa usc usf usk uss usu uua uuc uus uuu