a-a a-b aaa aab aak aas aau aav ab- aba abb abk abs abu abv aka akb akk aks aku akv as- asa asb ask ass asu asv au- aua aub auk aus auv av- ava avb avk avs avu b-u baa bab bak bas bau bav bba bbb bbk bbs bbu bka bkb bkk bks bkv bsa bsb bsk bss bsu bsv bua bub buk bus buu bva bvb bvk bvs bvu bvv ka- kaa kab kak kas kau kav kba kbb kbk kbs kbu kkb kkk kks kku kkv ksa ksb ksk kss ksu ksv kub kuk kus kuu kva kvb kvk kvs kvv saa sab sak sas sau sav sba sbb sbk sbs sbu sbv sk- ska skb skk sks sku ss- ssa ssb ssk sss ssu ssv sua sub suk sus suu suv sva svb svk svs svu svv ua- uaa uab uak uas uau uav uba ubb ubk ubs ubu ubv uka ukb ukk uku usa usb usk uss usu usv uua uus uuu uva uvb uvs uvu uvv v-a vaa vab vak vas vau vav vba vbk vbs vbv vka vkb vsa vsb vsk vss vsu vsv vuk vus vuv vva vvb vvs vvv