-er -ey bbb bbe bbo bbr bby be- beb bee beo ber bey bob boe boo bor boy brb bre bro brr bry by- bye byo byr ebb ebe ebo ebr eby eeb eee eeo eer eey eo- eob eoe eoo eor erb ere ero err ery eye eyo eyr ob- obb obe obo obr oby oeb oee oeo oer oey oo- oob ooo oor or- orb ore oro orr ory oye oyo rbb rbe rbo rbr re- reb ree reo rer rey rob roe roo ror roy rrb rrr ry- rye ryo ryr ryy ybe ybr yby yeb yee yeo yer yey yob yoe yoo yor yoy yre yro yyb yye yyy