a-a a-b a-z aaa aab aan aao aau aaz ab- aba abb abn abo abu abz an- ana anb ann ano anu anz aoa aob aon aoo aou au- aua aub aun auo auz az- aza azb azn azo azu azz b-u baa bab ban bao bau baz bba bbb bbn bbo bbu bna bnb bnn bno bnu bnz boa bob bon boo bou boz bua bub bun buo buu buz bza bzn bzo bzu bzz naa nab nan nao nau naz nba nbb nbn nbo nbu nna nnb nnn nno nnu nnz no- noa nob non noo nou noz nua nub nun nuo nuu nzb nzo nzz oaa oab oan oao oau ob- oba obb obn obo obu on- ona onb onn ono onu oo- ooa oob oon ooo ou- oua oun ouo oza ozo ozu ozz ua- uaa uab uan uao uau uaz uba ubb ubn ubo ubu un- una unb unn uno unu uoa uob uon uoo uua uun uuu uza uzb uzo uzu zaa zab zan zao zaz zbb znn zno zo- zoa zob zon zoo zou zub zun zuz zzz