-ey a-a a-b a-t aaa aab aae aas aat aax aay ab- aba abb abe abs abt abx aby aea aeb aee aes aet aex aey as- asa asb ase ass ast asx asy at- ata atb ate ats att atx ax- axa axe axs axt axx ay- aya aye ays ayt ayx baa bab bae bas bat bax bay bba bbb bbe bbs bbt bbx bby be- bea beb bee bes bet bex bey bsa bsb bse bss bst bsx bsy bta btb bte bts btt btx bty bxb bxx by- bya bye bys byt eaa eab eae eas eat eax eba ebb ebe ebs ebt ebx eby eea eeb eee ees eet eex eey es- esa esb ese ess est esx esy eta etb ete ets ett etx ety ex- exa exe exs ext exx exy eya eye eys eyt saa sab sae sas sat sax say sba sbb sbe sbs sbt sbx sby se- sea seb see ses set sex sey ss- ssa ssb sse sss sst ssx sta stb ste sts stt stx sty sxs sxt sy- sya syb sye sys syt syx t-x taa tab tae tas tat tax tay tba tbb tbe tbs tbt te- tea teb tee tes tet tex tey tsa tsb tse tss tst tsx tsy tta ttb tte tts ttt ttx tty txe txs txt tya tye tys tyt xaa xas xat xbe xbx xee xes xet xex xsa xsb xss xst xts xtx xty xxx xxy xyy yaa yab yae yas yat yax yay ybe ybs yby yea yeb yee yes yet yex yey ysa ysb yse yss yst ysy yta yte yts ytt yxa yxe yxy yyb yye yys yyt yyy