a-a a-b a-t aaa aab aad aae aat aau aax ab- aba abb abd abe abt abu abx ad- ada adb add ade adt adu adx aea aeb aed aee aet aeu aex at- ata atb atd ate att atu atx au- aua aub aud aue aut aux ax- axa axe axt axx b-u baa bab bad bae bat bau bax bba bbb bbd bbe bbt bbu bbx bda bdb bdd bde bdt bdu bdx be- bea beb bed bee bet beu bex bta btb btd bte btt btu btx bua bub bud bue but buu bux bxb bxd bxx daa dab dad dae dat dau dax dba dbb dbd dbe dbt dbu dbx dda ddb ddd dde ddt ddu ddx de- dea deb ded dee det deu dex dta dtb dtd dte dtt dtu dtx dua dub dud due dut dux dxd dxt dxx eaa eab ead eae eat eau eax eba ebb ebd ebe ebt ebu ebx ed- eda edb edd ede edt edu edx eea eeb eed eee eet eex eta etb etd ete ett etu etx eu- eua eub eud eue eut eux ex- exa exd exe ext exu exx t-x taa tab tad tae tat tau tax tba tbb tbd tbe tbt tbu tda tdb tdd tde tdt tdu tdx te- tea teb ted tee tet teu tex tta ttb ttd tte ttt ttu ttx tua tub tud tue tut tuu tux txe txt txu ua- uaa uab uad uae uat uau uba ubb ube ubt ubu ubx uda udb udd ude udt udu udx uea ueb ued uee uet uta utb utd ute utt utu utx uua uue uut uuu uxb uxt uxu xaa xad xat xau xbe xbx xda xdb xde xdt xed xee xet xeu xex xtx xue xxx