-er -ey bbb bbc bbe bbf bbo bbr bby bcb bcc bce bcf bco bcr bcy be- beb bec bee bef beo ber bey bfb bfc bfe bff bfo bfr bfy bob boc boe bof boo bor boy brb bre brf bro brr bry by- byc bye byf byo byr c-- cbb cbc cbe cbf cbo cbr cby ccb ccc cce ccf cco ccr ce- ceb cec cee cef ceo cer cey cfb cfc cfe cff cfo cfr co- cob coc coe cof coo cor coy crb crc cre crf cro crr cry cyb cyc cye cyf cyo cyr ebb ebc ebe ebf ebo ebr eby ec- ecb ecc ece ecf eco ecr eeb eec eee eef eeo eer eey ef- efb efc efe eff efo efr eo- eob eoc eoe eof eoo eor erb erc ere erf ero err ery eyc eye eyo eyr fbb fbc fbe fbf fbo fbr fcb fcc fce fcf fco fcr fcy feb fec fee fef feo fer fey ffc ffe fff ffo ffr ffy fob foc foe fof foo for foy frb frc fre frf fro frr fry fy- fyb fyc fye fyo ob- obb obc obe obf obo obr oby oc- ocb occ ocf oco ocr oeb oec oee oef oeo oer oey of- ofb ofc ofe off ofo ofr oo- oob ooc oof ooo oor or- orb orc ore orf oro orr ory oye oyo rbb rbc rbe rbf rbo rbr rcb rcc rce rcf rco rcr re- reb rec ree ref reo rer rey rfb rfc rfe rff rfo rfr rob roc roe rof roo ror roy rrb rrc rrf rrr ry- ryc rye ryf ryo ryr ryy ybc ybe ybf ybr yby ycc yce ycf yco ycy yeb yec yee yef yeo yer yey yfc yfe yff yfr yob yoc yoe yof yoo yor yoy yrc yre yrf yro yyb yyc yye yyf yyy