-ey a-a a-b a-t aaa aab aad aae aat aau aay ab- aba abb abd abe abt abu aby ad- ada adb add ade adt adu ady aea aeb aed aee aet aeu aey at- ata atb atd ate att atu au- aua aub aud aue aut ay- aya ayd aye ayt ayu b-u baa bab bad bae bat bau bay bba bbb bbd bbe bbt bbu bby bda bdb bdd bde bdt bdu bdy be- bea beb bed bee bet beu bey bta btb btd bte btt btu bty bua bub bud bue but buu buy by- bya byd bye byt byu daa dab dad dae dat dau day dba dbb dbd dbe dbt dbu dby dda ddb ddd dde ddt ddu ddy de- dea deb ded dee det deu dey dta dtb dtd dte dtt dtu dty dua dub dud due dut duy dy- dya dyb dyd dye dyu dyy eaa eab ead eae eat eau eba ebb ebd ebe ebt ebu eby ed- eda edb edd ede edt edu edy eea eeb eed eee eet eey eta etb etd ete ett etu ety eu- eua eub eud eue eut eya eyd eye eyt taa tab tad tae tat tau tay tba tbb tbd tbe tbt tbu tda tdb tdd tde tdt tdu tdy te- tea teb ted tee tet teu tey tta ttb ttd tte ttt ttu tty tua tub tud tue tut tuu tuy tya tyd tye tyt ua- uaa uab uad uae uat uau uay uba ubb ube ubt ubu uby uda udb udd ude udt udu uea ueb ued uee uet uey uta utb utd ute utt utu uty uua uue uut uuu uyu yaa yab yad yae yat yau yay ybe yby yda yde ydt ydy yea yeb yed yee yet yey yta ytd yte ytt ytu yua yud yue yut yuu yuy yyb yye yyt yyu yyy