-er -ey bbb bbc bbe bbf bbo bbr bbt bby bcb bcc bce bcf bco bcr bct bcy be- beb bec bee bef beo ber bet bey bfb bfc bfe bff bfo bfr bft bfy bob boc boe bof boo bor bot boy brb bre brf bro brr brt bry btb btc bte btf bto btr btt bty by- byc bye byf byo byr byt c-- cbb cbc cbe cbf cbo cbr cbt cby ccb ccc cce ccf cco ccr cct ce- ceb cec cee cef ceo cer cet cey cfb cfc cfe cff cfo cfr cft co- cob coc coe cof coo cor cot coy crb crc cre crf cro crr crt cry ctb ctc cte ctf cto ctr ctt cty cyb cyc cye cyf cyo cyr cyt ebb ebc ebe ebf ebo ebr ebt eby ec- ecb ecc ece ecf eco ecr ect eeb eec eee eef eeo eer eet eey ef- efb efc efe eff efo efr eft eo- eob eoc eoe eof eoo eor eot erb erc ere erf ero err ert ery etb etc ete etf eto etr ett ety eyc eye eyo eyr eyt fbb fbc fbe fbf fbo fbr fbt fcb fcc fce fcf fco fcr fct fcy feb fec fee fef feo fer fet fey ffc ffe fff ffo ffr fft ffy fob foc foe fof foo for fot foy frb frc fre frf fro frr frt fry ftb ftc fte ftf fto ftr ftt fty fy- fyb fyc fye fyo ob- obb obc obe obf obo obr obt oby oc- ocb occ ocf oco ocr oct oeb oec oee oef oeo oer oet oey of- ofb ofc ofe off ofo ofr oft oo- oob ooc oof ooo oor oot or- orb orc ore orf oro orr ort ory ot- otb otc ote otf oto otr ott oye oyo rbb rbc rbe rbf rbo rbr rbt rcb rcc rce rcf rco rcr rct re- reb rec ree ref reo rer ret rey rfb rfc rfe rff rfo rfr rft rob roc roe rof roo ror rot roy rrb rrc rrf rrr rrt rtb rtc rte rtf rto rtr rtt rty ry- ryc rye ryf ryo ryr ryy tbb tbc tbe tbf tbo tbr tbt tcb tcc tce tcf tco tcr tct te- teb tec tee tef teo ter tet tey tfb tfc tfe tff tfo tfr tft to- tob toc toe tof too tor tot toy trb trc tre trf tro trr trt try ttb ttc tte ttf tto ttr ttt tty tyc tye tyf tyo tyr tyt ybc ybe ybf ybr yby ycc yce ycf yco ycy yeb yec yee yef yeo yer yet yey yfc yfe yff yfr yft yob yoc yoe yof yoo yor yot yoy yrc yre yrf yro yrt ytc yte ytf yto ytr ytt yyb yyc yye yyf yyt yyy