a-a a-c aaa aac aaf aak aau aav ac- aca acc acf ack acu acv af- afa afc aff afk afu afv aka akc akk aku akv au- aua auc auf auk auv av- ava avc avf avk avu c-- caa cac caf cak cau cav cca ccc ccf cck ccu ccv cfa cfc cff cfk cfu cfv cka ckc cua cuc cuf cuk cuu cuv cva cvc cvf cvk cvu cvv faa fac faf fak fau fav fca fcc fcf fck fcu fcv ffa ffc fff ffk ffu ffv fka fkc fkf fkk fua fuf fuk fuu fuv fva fvc fvk ka- kaa kac kaf kak kau kav kca kcc kck kcu kfa kfc kff kfu kkc kkk kku kkv kuc kuk kuu kva kvk kvv ua- uaa uac uaf uak uau uav uca ucc ucf uck ucu ucv ufa ufc uff ufu ufv uka ukc ukf ukk uku uua uuc uuu uva uvc uvf uvu uvv v-a vaa vac vak vau vav vca vcc vcf vcu vfa vfc vff vfu vfv vka vuk vuv vva vvc vvv