-ey a-a a-b a-t aaa aab aad aae aas aat aay ab- aba abb abd abe abs abt aby ad- ada adb add ade ads adt ady aea aeb aed aee aes aet aey as- asa asb asd ase ass ast asy at- ata atb atd ate ats att ay- aya ayd aye ays ayt baa bab bad bae bas bat bay bba bbb bbd bbe bbs bbt bby bda bdb bdd bde bds bdt bdy be- bea beb bed bee bes bet bey bsa bsb bsd bse bss bst bsy bta btb btd bte bts btt bty by- bya byd bye bys byt daa dab dad dae das dat day dba dbb dbd dbe dbs dbt dby dda ddb ddd dde dds ddt ddy de- dea deb ded dee des det dey dsa dsb dsd dse dss dst dsy dta dtb dtd dte dts dtt dty dy- dya dyb dyd dye dys dyy eaa eab ead eae eas eat eba ebb ebd ebe ebs ebt eby ed- eda edb edd ede eds edt edy eea eeb eed eee ees eet eey es- esa esb esd ese ess est esy eta etb etd ete ets ett ety eya eyd eye eys eyt saa sab sad sae sas sat say sba sbb sbd sbe sbs sbt sby sda sdb sdd sde sds sdt sdy se- sea seb sed see ses set sey ss- ssa ssb ssd sse sss sst sta stb std ste sts stt sty sy- sya syb syd sye sys syt taa tab tad tae tas tat tay tba tbb tbd tbe tbs tbt tda tdb tdd tde tds tdt tdy te- tea teb ted tee tes tet tey tsa tsb tsd tse tss tst tsy tta ttb ttd tte tts ttt tty tya tyd tye tys tyt yaa yab yad yae yas yat yay ybe ybs yby yda yde yds ydt ydy yea yeb yed yee yes yet yey ysa ysb yse yss yst ysy yta ytd yte yts ytt yyb yye yys yyt yyy