-er -ey b-u bbb bbe bbi bbr bbu bby be- beb bee bei ber beu bey bi- bib bie bii bir biu biy brb bre bri brr bru bry bub bue bui bur buu buy by- bye byi byr byu ebb ebe ebi ebr ebu eby eeb eee eer eey eib eie eii eir eiu erb ere eri err eru ery eu- eub eue eui eur eye eyr ibb ibe ibi ibr ibu iby ie- iee iei ier iey iib iie iii iir iiu ir- irb ire iri irr iru iry iu- iub iue iui iur iye iyr iyy rbb rbe rbi rbr rbu re- reb ree rei rer reu rey rib rie rii rir riy rrb rri rrr rru rub rue rui rur ruu ruy ry- rye ryr ryu ryy ubb ube ubi ubr ubu uby ueb uee uei uer uey uib uie uii uir uiu ur- urb ure uri urr uru ury uue uur uuu uyi uyu ybe ybi ybr yby yeb yee yei yer yey yie yii yir yre yru yue yui yur yuu yuy yyb yye yyu yyy