-er -ey a-a a-b a-c a-t aaa aab aac aae aar aat aay ab- aba abb abc abe abr abt aby ac- aca acb acc ace acr act acy aea aeb aec aee aer aet aey ar- ara arb arc are arr art ary at- ata atb atc ate atr att ay- aya ayc aye ayr ayt baa bab bac bae bar bat bay bba bbb bbc bbe bbr bbt bby bca bcb bcc bce bcr bct bcy be- bea beb bec bee ber bet bey bra brb bre brr brt bry bta btb btc bte btr btt bty by- bya byc bye byr byt c-- caa cab cac cae car cat cay cba cbb cbc cbe cbr cbt cby cca ccb ccc cce ccr cct ce- cea ceb cec cee cer cet cey cra crb crc cre crr crt cry cta ctb ctc cte ctr ctt cty cya cyb cyc cye cyr cyt eaa eab eac eae ear eat eba ebb ebc ebe ebr ebt eby ec- eca ecb ecc ece ecr ect eea eeb eec eee eer eet eey era erb erc ere err ert ery eta etb etc ete etr ett ety eya eyc eye eyr eyt ra- raa rab rac rae rar rat ray rba rbb rbc rbe rbr rbt rca rcb rcc rce rcr rct re- rea reb rec ree rer ret rey rra rrb rrc rrr rrt rta rtb rtc rte rtr rtt rty ry- rya ryc rye ryr ryy taa tab tac tae tar tat tay tba tbb tbc tbe tbr tbt tca tcb tcc tce tcr tct te- tea teb tec tee ter tet tey tra trb trc tre trr trt try tta ttb ttc tte ttr ttt tty tya tyc tye tyr tyt yaa yab yac yae yar yat yay ybc ybe ybr yby yca ycc yce ycy yea yeb yec yee yer yet yey yra yrc yre yrt yta ytc yte ytr ytt yyb yyc yye yyt yyy