-ey a-a a-b a-c a-t aaa aab aac aae aag aao aat aay ab- aba abb abc abe abg abo abt aby ac- aca acb acc ace acg aco act acy aea aeb aec aee aeg aeo aet aey ag- aga agb agc age agg ago agt agy aoa aob aoc aoe aog aoo aot at- ata atb atc ate atg ato att ay- aya ayc aye ayo ayt baa bab bac bae bag bao bat bay bba bbb bbc bbe bbg bbo bbt bby bca bcb bcc bce bcg bco bct bcy be- bea beb bec bee beg beo bet bey bga bgb bgc bge bgg bgo bgt boa bob boc boe bog boo bot boy bta btb btc bte btg bto btt bty by- bya byc bye byg byo byt c-- caa cab cac cae cag cao cat cay cba cbb cbc cbe cbg cbo cbt cby cca ccb ccc cce ccg cco cct ce- cea ceb cec cee ceg ceo cet cey cga cgb cgc cge cgg cgo cgt cgy co- coa cob coc coe cog coo cot coy cta ctb ctc cte ctg cto ctt cty cya cyb cyc cye cyg cyo cyt eaa eab eac eae eag eao eat eba ebb ebc ebe ebg ebo ebt eby ec- eca ecb ecc ece ecg eco ect eea eeb eec eee eeg eeo eet eey ega egb egc ege egg ego egt egy eo- eoa eob eoc eoe eog eoo eot eta etb etc ete etg eto ett ety eya eyc eye eyo eyt gaa gab gac gae gag gao gat gay gba gbc gbe gbg gbo gbt gby gca gcb gcc gce gcg gco gct ge- gea geb gec gee geg geo get gey gga ggb ggc ggg ggo ggt goa gob goc goe gog goo got goy gta gtb gtc gte gtg gto gtt gty gy- gya gyb gye gyo oaa oab oac oae oag oao oat ob- oba obb obc obe obg obo obt oby oc- oca ocb occ ocg oco oct oea oeb oec oee oeg oeo oet oey oga ogc oge ogg ogo ogt ogy oo- ooa oob ooc oog ooo oot ot- ota otb otc ote otg oto ott oya oye oyo taa tab tac tae tag tao tat tay tba tbb tbc tbe tbg tbo tbt tca tcb tcc tce tcg tco tct te- tea teb tec tee teg teo tet tey tga tgb tgc tge tgg tgo tgt tgy to- toa tob toc toe tog too tot toy tta ttb ttc tte ttg tto ttt tty tya tyc tye tyg tyo tyt yaa yab yac yae yag yao yat yay ybc ybe ybg yby yca ycc yce yco ycy yea yeb yec yee yeg yeo yet yey yga ygc ygo yob yoc yoe yog yoo yot yoy yta ytc yte yto ytt yyb yyc yye yyg yyt yyy