a-a a-b a-z aaa aab aag aan aao aaz ab- aba abb abg abn abo abz ag- aga agb agg agn ago agz an- ana anb ang ann ano anz aoa aob aog aon aoo az- aza azb azg azn azo azz baa bab bag ban bao baz bba bbb bbg bbn bbo bga bgb bgg bgn bgo bgz bna bnb bng bnn bno bnz boa bob bog bon boo boz bza bzn bzo bzz gaa gab gag gan gao gaz gba gbg gbn gbo gbz gga ggb ggg ggn ggo ggz gna gnb gnn gno goa gob gog gon goo goz gza gzo naa nab nag nan nao naz nba nbb nbg nbn nbo nga ngb ngg ngn ngo nna nnb nng nnn nno nnz no- noa nob nog non noo noz nzb nzg nzo nzz oaa oab oag oan oao ob- oba obb obg obn obo oga ogg ogn ogo on- ona onb ong onn ono oo- ooa oob oog oon ooo oza ozo ozz z-g zaa zab zag zan zao zaz zbb zgb zgg znn zno zo- zoa zob zog zon zoo zzz