a-a a-b aaa aab aae aag aao aau ab- aba abb abe abg abo abu aea aeb aee aeg aeo aeu ag- aga agb age agg ago agu aoa aob aoe aog aoo aou au- aua aub aue aug auo b-u baa bab bae bag bao bau bba bbb bbe bbg bbo bbu be- bea beb bee beg beo beu bga bgb bge bgg bgo bgu boa bob boe bog boo bou bua bub bue bug buo buu eaa eab eae eag eao eau eba ebb ebe ebg ebo ebu eea eeb eee eeg eeo ega egb ege egg ego egu eo- eoa eob eoe eog eoo eou eu- eua eub eue eug gaa gab gae gag gao gau gba gbe gbg gbo gbu ge- gea geb gee geg geo geu gga ggb ggg ggo ggu goa gob goe gog goo gou gu- gua gub gue gug guo guu oaa oab oae oag oao oau ob- oba obb obe obg obo obu oea oeb oee oeg oeo oga oge ogg ogo oo- ooa oob oog ooo ou- oua oue ouo ua- uaa uab uae uag uao uau uba ubb ube ubg ubo ubu uea ueb uee ueg uga ugb uge ugg ugo ugu uoa uob uoe uog uoo uua uue uug uuu