-er -ey a-a a-b a-c a-t aaa aab aac aae aag aar aat aay ab- aba abb abc abe abg abr abt aby ac- aca acb acc ace acg acr act acy aea aeb aec aee aeg aer aet aey ag- aga agb agc age agg agr agt agy ar- ara arb arc are arg arr art ary at- ata atb atc ate atg atr att ay- aya ayc aye ayr ayt baa bab bac bae bag bar bat bay bba bbb bbc bbe bbg bbr bbt bby bca bcb bcc bce bcg bcr bct bcy be- bea beb bec bee beg ber bet bey bga bgb bgc bge bgg bgr bgt bra brb bre brg brr brt bry bta btb btc bte btg btr btt bty by- bya byc bye byg byr byt c-- caa cab cac cae cag car cat cay cba cbb cbc cbe cbg cbr cbt cby cca ccb ccc cce ccg ccr cct ce- cea ceb cec cee ceg cer cet cey cga cgb cgc cge cgg cgr cgt cgy cra crb crc cre crg crr crt cry cta ctb ctc cte ctg ctr ctt cty cya cyb cyc cye cyg cyr cyt eaa eab eac eae eag ear eat eba ebb ebc ebe ebg ebr ebt eby ec- eca ecb ecc ece ecg ecr ect eea eeb eec eee eeg eer eet eey ega egb egc ege egg egr egt egy era erb erc ere erg err ert ery eta etb etc ete etg etr ett ety eya eyc eye eyr eyt gaa gab gac gae gag gar gat gay gba gbc gbe gbg gbr gbt gby gca gcb gcc gce gcg gcr gct ge- gea geb gec gee geg ger get gey gga ggb ggc ggg ggr ggt gra grb grc gre grg grr grt gry gta gtb gtc gte gtg gtr gtt gty gy- gya gyb gye gyr ra- raa rab rac rae rag rar rat ray rba rbb rbc rbe rbg rbr rbt rca rcb rcc rce rcg rcr rct re- rea reb rec ree reg rer ret rey rga rgb rgc rge rgg rgr rgt rra rrb rrc rrg rrr rrt rta rtb rtc rte rtg rtr rtt rty ry- rya ryc rye ryg ryr ryy taa tab tac tae tag tar tat tay tba tbb tbc tbe tbg tbr tbt tca tcb tcc tce tcg tcr tct te- tea teb tec tee teg ter tet tey tga tgb tgc tge tgg tgr tgt tgy tra trb trc tre trg trr trt try tta ttb ttc tte ttg ttr ttt tty tya tyc tye tyg tyr tyt yaa yab yac yae yag yar yat yay ybc ybe ybg ybr yby yca ycc yce ycy yea yeb yec yee yeg yer yet yey yga ygc yra yrc yre yrg yrt yta ytc yte ytr ytt yyb yyc yye yyg yyt yyy