a-a a-b a-z aaa aab aan aao aau aav aaz ab- aba abb abn abo abu abv abz an- ana anb ann ano anu anv anz aoa aob aon aoo aou aov au- aua aub aun auo auv auz av- ava avb avn avo avu avz az- aza azb azn azo azu azz b-u baa bab ban bao bau bav baz bba bbb bbn bbo bbu bna bnb bnn bno bnu bnv bnz boa bob bon boo bou bov boz bua bub bun buo buu buz bva bvb bvn bvo bvu bvv bza bzn bzo bzu bzz naa nab nan nao nau nav naz nba nbb nbn nbo nbu nbv nna nnb nnn nno nnu nnv nnz no- noa nob non noo nou nov noz nua nub nun nuo nuu nuv nva nvb nvn nvu nvv nzb nzo nzz oaa oab oan oao oau oav ob- oba obb obn obo obu obv on- ona onb onn ono onu oo- ooa oob oon ooo oov ou- oua oun ouo ov- ova ovb ovo ovv oza ozo ozu ozz ua- uaa uab uan uao uau uav uaz uba ubb ubn ubo ubu ubv un- una unb unn uno unu unv uoa uob uon uoo uua uun uuu uva uvb uvo uvu uvv uza uzb uzo uzu v-a vaa vab van vao vau vav vaz vba vbo vbv vbz vn- vna vno vnu vnv voa vob von voo vou vov voz vuv vuz vva vvb vvo vvv vvz vzn zaa zab zan zao zav zaz zbb zbv znn zno zo- zoa zob zon zoo zou zub zun zuz zzz