a-a a-b a-z aaa aab aah aan aao aaz ab- aba abb abh abn abo abz aha ahb ahh ahn aho ahz an- ana anb anh ann ano anz aoa aob aoh aon aoo az- aza azb azn azo azz baa bab bah ban bao baz bba bbb bbh bbn bbo bha bhb bhh bho bna bnb bnn bno bnz boa bob boh bon boo boz bza bzh bzn bzo bzz haa hab hah han hao haz hba hbb hbh hbn hbo hbz hha hhb hhh hhn hho hhz hna hnb hnh hnn hno hnz hoa hob hoh hon hoo hzo naa nab nah nan nao naz nba nbb nbn nbo nha nhb nhh nhn nhz nna nnb nnh nnn nno nnz no- noa nob noh non noo noz nzb nzo nzz oaa oab oah oan oao ob- oba obb obh obn obo oha ohh ohn oho on- ona onb onh onn ono oo- ooa oob ooh oon ooo oza ozo ozz zaa zab zah zan zao zaz zbb zha zho znn zno zo- zoa zob zon zoo zzz