a-a a-b a-z aaa aab aar aau aav aaz ab- aba abb abr abu abv abz ar- ara arb arr aru arv arz au- aua aub aur auv auz av- ava avb avr avu avz az- aza azb azu azz b-u baa bab bar bau bav baz bba bbb bbr bbu bra brb brr bru brv brz bua bub bur buu buz bva bvb bvr bvu bvv bza bzr bzu bzz ra- raa rab rar rau rav raz rba rbb rbr rbu rra rrb rrr rru rua rub rur ruu ruv ruz rva rvb rvr rvu rvv rza rzb ua- uaa uab uar uau uav uaz uba ubb ubr ubu ubv ur- ura urb urr uru urz uua uur uuu uva uvb uvu uvv uza uzb uzu v-a vaa vab var vau vav vaz vba vbr vbv vbz vra vrb vrr vru vur vuv vuz vva vvb vvr vvv vvz zaa zab zar zav zaz zbb zbr zbv zub zur zuz zzr zzz