a-a a-b aaa aab aag aah aau ab- aba abb abg abh abu ag- aga agb agg agh agu aha ahb ahg ahh ahu au- aua aub aug auh b-u baa bab bag bah bau bba bbb bbg bbh bbu bga bgb bgg bgh bgu bha bhb bhg bhh bhu bua bub bug buh buu gaa gab gag gah gau gba gbg gbh gbu gga ggb ggg ggh ggu gha ghb ghg ghh gu- gua gub gug guu haa hab hag hah hau hba hbb hbg hbh hbu hga hgb hgg hgh hgu hha hhb hhg hhh hhu hua hub hug huh huu ua- uaa uab uag uah uau uba ubb ubg ubh ubu uga ugb ugg ugh ugu uha uhb uhh uhu uua uug uuu