-er -ey bbb bbe bbn bbr bbt bby be- beb bee ben ber bet bey bnb bne bnn bnr bnt brb bre brn brr brt bry btb bte btn btr btt bty by- bye byn byr byt ebb ebe ebn ebr ebt eby eeb eee een eer eet eey en- enb ene enn enr ent eny erb ere ern err ert ery etb ete etn etr ett ety eye eyn eyr eyt nbb nbe nbn nbr nbt ne- neb nee nen ner net ney nnb nne nnn nnt nrb nre nrn nrr nrt nry ntb nte ntn ntr ntt nye nyn nyt nyy rbb rbe rbn rbr rbt re- reb ree ren rer ret rey rnb rnn rnr rnt rny rrb rrn rrr rrt rtb rte rtn rtr rtt rty ry- rye ryn ryr ryy tbb tbe tbn tbr tbt te- teb tee ten ter tet tey tnb tne tnn tnr tnt trb tre trn trr trt try ttb tte ttn ttr ttt tty tye tyn tyr tyt ybe ybr yby yeb yee yen yer yet yey yne ynn yny yre yrn yrt yte ytn ytr ytt yyb yye yyt yyy