-ey a-a a-b a-c a-t aaa aab aac aad aae aat aay ab- aba abb abc abd abe abt aby ac- aca acb acc acd ace act acy ad- ada adb adc add ade adt ady aea aeb aec aed aee aet aey at- ata atb atc atd ate att ay- aya ayc ayd aye ayt baa bab bac bad bae bat bay bba bbb bbc bbd bbe bbt bby bca bcb bcc bcd bce bct bcy bda bdb bdc bdd bde bdt bdy be- bea beb bec bed bee bet bey bta btb btc btd bte btt bty by- bya byc byd bye byt c-- caa cab cac cad cae cat cay cba cbb cbc cbd cbe cbt cby cca ccb ccc ccd cce cct cda cdb cdc cdd cde cdt cdy ce- cea ceb cec ced cee cet cey cta ctb ctc ctd cte ctt cty cya cyb cyc cyd cye cyt daa dab dac dad dae dat day dba dbb dbc dbd dbe dbt dby dca dcb dcc dcd dce dct dda ddb ddc ddd dde ddt ddy de- dea deb dec ded dee det dey dta dtb dtc dtd dte dtt dty dy- dya dyb dyc dyd dye dyy eaa eab eac ead eae eat eba ebb ebc ebd ebe ebt eby ec- eca ecb ecc ecd ece ect ed- eda edb edc edd ede edt edy eea eeb eec eed eee eet eey eta etb etc etd ete ett ety eya eyc eyd eye eyt taa tab tac tad tae tat tay tba tbb tbc tbd tbe tbt tca tcb tcc tcd tce tct tda tdb tdc tdd tde tdt tdy te- tea teb tec ted tee tet tey tta ttb ttc ttd tte ttt tty tya tyc tyd tye tyt yaa yab yac yad yae yat yay ybc ybe yby yca ycc ycd yce ycy yda yde ydt ydy yea yeb yec yed yee yet yey yta ytc ytd yte ytt yyb yyc yye yyt yyy