-er -ey bbb bbe bbf bbk bbo bbr bby be- beb bee bef bek beo ber bey bfb bfe bff bfo bfr bfy bkb bke bkf bkk bko bkr bob boe bof bok boo bor boy brb bre brf brk bro brr bry by- bye byf byk byo byr ebb ebe ebf ebk ebo ebr eby eeb eee eef eek eeo eer eey ef- efb efe eff efo efr ekb eke ekf eko ekr eky eo- eob eoe eof eok eoo eor erb ere erf erk ero err ery eye eyo eyr fbb fbe fbf fbk fbo fbr feb fee fef fek feo fer fey ffe fff ffk ffo ffr ffy fkb fkf fkk fob foe fof fok foo for foy frb fre frf frk fro frr fry fy- fyb fye fyk fyo kbb kbe kbf kbk kbo kbr ke- keb kee kef kek keo ker key kff kfo kkb kke kkk kkr kky kob koe kof kok koo kor koy krf krk kro krr kry kye kyo kyr ob- obb obe obf obk obo obr oby oeb oee oef oeo oer oey of- ofb ofe off ofo ofr okb oke okk oko okr oo- oob oof ook ooo oor or- orb ore orf ork oro orr ory oye oyo rbb rbe rbf rbk rbo rbr re- reb ree ref rek reo rer rey rfb rfe rff rfk rfo rfr rkb rke rkf rkk rko rky rob roe rof rok roo ror roy rrb rrf rrk rrr ry- rye ryf ryk ryo ryr ryy ybe ybf ybr yby yeb yee yef yek yeo yer yey yfe yff yfr ykk yob yoe yof yok yoo yor yoy yre yrf yro yyb yye yyf yyy