-er -ey bbb bbc bbe bbo bbr bby bcb bcc bce bco bcr bcy be- beb bec bee beo ber bey bob boc boe boo bor boy brb bre bro brr bry by- byc bye byo byr c-- cbb cbc cbe cbo cbr cby ccb ccc cce cco ccr ce- ceb cec cee ceo cer cey co- cob coc coe coo cor coy crb crc cre cro crr cry cyb cyc cye cyo cyr ebb ebc ebe ebo ebr eby ec- ecb ecc ece eco ecr eeb eec eee eeo eer eey eo- eob eoc eoe eoo eor erb erc ere ero err ery eyc eye eyo eyr ob- obb obc obe obo obr oby oc- ocb occ oco ocr oeb oec oee oeo oer oey oo- oob ooc ooo oor or- orb orc ore oro orr ory oye oyo rbb rbc rbe rbo rbr rcb rcc rce rco rcr re- reb rec ree reo rer rey rob roc roe roo ror roy rrb rrc rrr ry- ryc rye ryo ryr ryy ybc ybe ybr yby ycc yce yco ycy yeb yec yee yeo yer yey yob yoc yoe yoo yor yoy yrc yre yro yyb yyc yye yyy