a-a a-b aaa aab aae aag aau ab- aba abb abe abg abu aea aeb aee aeg aeu ag- aga agb age agg agu au- aua aub aue aug b-u baa bab bae bag bau bba bbb bbe bbg bbu be- bea beb bee beg beu bga bgb bge bgg bgu bua bub bue bug buu eaa eab eae eag eau eba ebb ebe ebg ebu eea eeb eee eeg ega egb ege egg egu eu- eua eub eue eug gaa gab gae gag gau gba gbe gbg gbu ge- gea geb gee geg geu gga ggb ggg ggu gu- gua gub gue gug guu ua- uaa uab uae uag uau uba ubb ube ubg ubu uea ueb uee ueg uga ugb uge ugg ugu uua uue uug uuu