a-a a-b a-z aaa aab aag aan aao aas aaz ab- aba abb abg abn abo abs abz ag- aga agb agg agn ago ags agz an- ana anb ang ann ano ans anz aoa aob aog aon aoo aos as- asa asb asg asn aso ass asz az- aza azb azg azn azo azs azz baa bab bag ban bao bas baz bba bbb bbg bbn bbo bbs bga bgb bgg bgn bgo bgs bgz bna bnb bng bnn bno bns bnz boa bob bog bon boo bos boz bsa bsb bsg bsn bso bss bza bzn bzo bzs bzz gaa gab gag gan gao gas gaz gba gbg gbn gbo gbs gbz gga ggb ggg ggn ggo ggs ggz gna gnb gnn gno gns goa gob gog gon goo gos goz gsa gsb gsg gsn gso gss gza gzo naa nab nag nan nao nas naz nba nbb nbg nbn nbo nbs nga ngb ngg ngn ngo ngs nna nnb nng nnn nno nns nnz no- noa nob nog non noo nos noz nsa nsb nsg nsn nso nss nsz nzb nzg nzo nzs nzz oaa oab oag oan oao oas ob- oba obb obg obn obo obs oga ogg ogn ogo ogs on- ona onb ong onn ono ons oo- ooa oob oog oon ooo oos os- osa osb osg osn oso oss oza ozo ozs ozz saa sab sag san sao sas saz sba sbb sbg sbn sbo sbs sga sgb sgg sgn sgo sgs sna snb sng snn sno sns soa sob sog son soo sos soz ss- ssa ssb ssg ssn sso sss ssz sza z-g zaa zab zag zan zao zas zaz zbb zbs zgb zgg zgs znn zno zns zo- zoa zob zog zon zoo zos zsa zsg zsz zzs zzz