a-a a-b a-t aaa aab aad aae aat aau ab- aba abb abd abe abt abu ad- ada adb add ade adt adu aea aeb aed aee aet aeu at- ata atb atd ate att atu au- aua aub aud aue aut b-u baa bab bad bae bat bau bba bbb bbd bbe bbt bbu bda bdb bdd bde bdt bdu be- bea beb bed bee bet beu bta btb btd bte btt btu bua bub bud bue but buu daa dab dad dae dat dau dba dbb dbd dbe dbt dbu dda ddb ddd dde ddt ddu de- dea deb ded dee det deu dta dtb dtd dte dtt dtu dua dub dud due dut eaa eab ead eae eat eau eba ebb ebd ebe ebt ebu ed- eda edb edd ede edt edu eea eeb eed eee eet eta etb etd ete ett etu eu- eua eub eud eue eut taa tab tad tae tat tau tba tbb tbd tbe tbt tbu tda tdb tdd tde tdt tdu te- tea teb ted tee tet teu tta ttb ttd tte ttt ttu tua tub tud tue tut tuu ua- uaa uab uad uae uat uau uba ubb ube ubt ubu uda udb udd ude udt udu uea ueb ued uee uet uta utb utd ute utt utu uua uue uut uuu