a-a a-b aaa aab aag aao aas aau ab- aba abb abg abo abs abu ag- aga agb agg ago ags agu aoa aob aog aoo aos aou as- asa asb asg aso ass asu au- aua aub aug auo aus b-u baa bab bag bao bas bau bba bbb bbg bbo bbs bbu bga bgb bgg bgo bgs bgu boa bob bog boo bos bou bsa bsb bsg bso bss bsu bua bub bug buo bus buu gaa gab gag gao gas gau gba gbg gbo gbs gbu gga ggb ggg ggo ggs ggu goa gob gog goo gos gou gsa gsb gsg gso gss gsu gu- gua gub gug guo gus guu oaa oab oag oao oas oau ob- oba obb obg obo obs obu oga ogg ogo ogs oo- ooa oob oog ooo oos os- osa osb osg oso oss osu ou- oua ouo ous saa sab sag sao sas sau sba sbb sbg sbo sbs sbu sga sgb sgg sgo sgs sgu soa sob sog soo sos sou ss- ssa ssb ssg sso sss ssu sua sub sug suo sus suu ua- uaa uab uag uao uas uau uba ubb ubg ubo ubs ubu uga ugb ugg ugo ugs ugu uoa uob uog uoo uos usa usb usg uso uss usu uua uug uus uuu