-er -ey b-u bbb bbe bbn bbr bbu bby be- beb bee ben ber beu bey bnb bne bnn bnr bnu brb bre brn brr bru bry bub bue bun bur buu buy by- bye byn byr byu ebb ebe ebn ebr ebu eby eeb eee een eer eey en- enb ene enn enr enu eny erb ere ern err eru ery eu- eub eue eun eur eye eyn eyr nbb nbe nbn nbr nbu ne- neb nee nen ner neu ney nnb nne nnn nnu nrb nre nrn nrr nru nry nub nue nun nur nuu nuy nye nyn nyu nyy rbb rbe rbn rbr rbu re- reb ree ren rer reu rey rnb rnn rnr rnu rny rrb rrn rrr rru rub rue run rur ruu ruy ry- rye ryn ryr ryu ryy ubb ube ubn ubr ubu uby ueb uee uen uer uey un- unb une unn unr unu uny ur- urb ure urn urr uru ury uue uun uur uuu uyu ybe ybr yby yeb yee yen yer yey yne ynn ynu yny yre yrn yru yue yun yur yuu yuy yyb yye yyu yyy