-er -ey bbb bbc bbe bbf bbk bbo bbr bby bcb bcc bce bcf bck bco bcr bcy be- beb bec bee bef bek beo ber bey bfb bfc bfe bff bfo bfr bfy bkb bkc bke bkf bkk bko bkr bob boc boe bof bok boo bor boy brb bre brf brk bro brr bry by- byc bye byf byk byo byr c-- cbb cbc cbe cbf cbk cbo cbr cby ccb ccc cce ccf cck cco ccr ce- ceb cec cee cef cek ceo cer cey cfb cfc cfe cff cfk cfo cfr ckb ckc cko cky co- cob coc coe cof cok coo cor coy crb crc cre crf crk cro crr cry cyb cyc cye cyf cyk cyo cyr ebb ebc ebe ebf ebk ebo ebr eby ec- ecb ecc ece ecf eck eco ecr eeb eec eee eef eek eeo eer eey ef- efb efc efe eff efo efr ekb ekc eke ekf eko ekr eky eo- eob eoc eoe eof eok eoo eor erb erc ere erf erk ero err ery eyc eye eyo eyr fbb fbc fbe fbf fbk fbo fbr fcb fcc fce fcf fck fco fcr fcy feb fec fee fef fek feo fer fey ffc ffe fff ffk ffo ffr ffy fkb fkc fkf fkk fob foc foe fof fok foo for foy frb frc fre frf frk fro frr fry fy- fyb fyc fye fyk fyo kbb kbc kbe kbf kbk kbo kbr kcb kcc kce kck kcr ke- keb kec kee kef kek keo ker key kfc kff kfo kkb kkc kke kkk kkr kky kob koc koe kof kok koo kor koy krc krf krk kro krr kry kyc kye kyo kyr ob- obb obc obe obf obk obo obr oby oc- ocb occ ocf ock oco ocr oeb oec oee oef oeo oer oey of- ofb ofc ofe off ofo ofr okb okc oke okk oko okr oo- oob ooc oof ook ooo oor or- orb orc ore orf ork oro orr ory oye oyo rbb rbc rbe rbf rbk rbo rbr rcb rcc rce rcf rco rcr re- reb rec ree ref rek reo rer rey rfb rfc rfe rff rfk rfo rfr rkb rkc rke rkf rkk rko rky rob roc roe rof rok roo ror roy rrb rrc rrf rrk rrr ry- ryc rye ryf ryk ryo ryr ryy ybc ybe ybf ybr yby ycc yce ycf yco ycy yeb yec yee yef yek yeo yer yey yfc yfe yff yfr ykk yob yoc yoe yof yok yoo yor yoy yrc yre yrf yro yyb yyc yye yyf yyy