-er -ey b-u bbb bbe bbo bbr bbu bby be- beb bee beo ber beu bey bob boe boo bor bou boy brb bre bro brr bru bry bub bue buo bur buu buy by- bye byo byr byu ebb ebe ebo ebr ebu eby eeb eee eeo eer eey eo- eob eoe eoo eor eou erb ere ero err eru ery eu- eub eue eur eye eyo eyr ob- obb obe obo obr obu oby oeb oee oeo oer oey oo- oob ooo oor or- orb ore oro orr oru ory ou- oue ouo our oye oyo rbb rbe rbo rbr rbu re- reb ree reo rer reu rey rob roe roo ror rou roy rrb rrr rru rub rue ruo rur ruu ruy ry- rye ryo ryr ryu ryy ubb ube ubo ubr ubu uby ueb uee uer uey uob uoe uoo uor ur- urb ure uro urr uru ury uue uur uuu uyo uyu ybe ybr yby yeb yee yeo yer yey yob yoe yoo yor you yoy yre yro yru yue yuo yur yuu yuy yyb yye yyu yyy