a-a a-b aaa aab aag aah aao aau ab- aba abb abg abh abo abu ag- aga agb agg agh ago agu aha ahb ahg ahh aho ahu aoa aob aog aoh aoo aou au- aua aub aug auh auo b-u baa bab bag bah bao bau bba bbb bbg bbh bbo bbu bga bgb bgg bgh bgo bgu bha bhb bhg bhh bho bhu boa bob bog boh boo bou bua bub bug buh buo buu gaa gab gag gah gao gau gba gbg gbh gbo gbu gga ggb ggg ggh ggo ggu gha ghb ghg ghh gho goa gob gog goh goo gou gu- gua gub gug guo guu haa hab hag hah hao hau hba hbb hbg hbh hbo hbu hga hgb hgg hgh hgo hgu hha hhb hhg hhh hho hhu hoa hob hog hoh hoo hou hua hub hug huh huo huu oaa oab oag oah oao oau ob- oba obb obg obh obo obu oga ogg ogh ogo oha ohg ohh oho ohu oo- ooa oob oog ooh ooo ou- oua ouh ouo ua- uaa uab uag uah uao uau uba ubb ubg ubh ubo ubu uga ugb ugg ugh ugo ugu uha uhb uhh uho uhu uoa uob uog uoo uua uug uuu