a-a a-b a-t aaa aab aae aat aau ab- aba abb abe abt abu aea aeb aee aet aeu at- ata atb ate att atu au- aua aub aue aut b-u baa bab bae bat bau bba bbb bbe bbt bbu be- bea beb bee bet beu bta btb bte btt btu bua bub bue but buu eaa eab eae eat eau eba ebb ebe ebt ebu eea eeb eee eet eta etb ete ett etu eu- eua eub eue eut taa tab tae tat tau tba tbb tbe tbt tbu te- tea teb tee tet teu tta ttb tte ttt ttu tua tub tue tut tuu ua- uaa uab uae uat uau uba ubb ube ubt ubu uea ueb uee uet uta utb ute utt utu uua uue uut uuu