-er -ey bbb bbc bbe bbn bbr bbt bby bcb bcc bce bcn bcr bct bcy be- beb bec bee ben ber bet bey bnb bnc bne bnn bnr bnt brb bre brn brr brt bry btb btc bte btn btr btt bty by- byc bye byn byr byt c-- cbb cbc cbe cbn cbr cbt cby ccb ccc cce ccn ccr cct ce- ceb cec cee cen cer cet cey cn- cnb cnc cne cnn cnr cnt cny crb crc cre crn crr crt cry ctb ctc cte ctn ctr ctt cty cyb cyc cye cyn cyr cyt ebb ebc ebe ebn ebr ebt eby ec- ecb ecc ece ecn ecr ect eeb eec eee een eer eet eey en- enb enc ene enn enr ent eny erb erc ere ern err ert ery etb etc ete etn etr ett ety eyc eye eyn eyr eyt nbb nbc nbe nbn nbr nbt ncb ncc nce ncn ncr nct ne- neb nec nee nen ner net ney nnb nnc nne nnn nnt nrb nrc nre nrn nrr nrt nry ntb ntc nte ntn ntr ntt nyc nye nyn nyt nyy rbb rbc rbe rbn rbr rbt rcb rcc rce rcn rcr rct re- reb rec ree ren rer ret rey rnb rnc rnn rnr rnt rny rrb rrc rrn rrr rrt rtb rtc rte rtn rtr rtt rty ry- ryc rye ryn ryr ryy tbb tbc tbe tbn tbr tbt tcb tcc tce tcn tcr tct te- teb tec tee ten ter tet tey tnb tnc tne tnn tnr tnt trb trc tre trn trr trt try ttb ttc tte ttn ttr ttt tty tyc tye tyn tyr tyt ybc ybe ybr yby ycc yce ycy yeb yec yee yen yer yet yey yne ynn yny yrc yre yrn yrt ytc yte ytn ytr ytt yyb yyc yye yyt yyy