-er -ey bbb bbc bbe bbo bbr bby bcb bcc bce bco bcr bcy bcz be- beb bec bee beo ber bey bez bob boc boe boo bor boy boz brb bre bro brr bry brz by- byc bye byo byr byz bze bzo bzr bzz c-- cbb cbc cbe cbo cbr cby cbz ccb ccc cce cco ccr ccz ce- ceb cec cee ceo cer cey cez co- cob coc coe coo cor coy coz crb crc cre cro crr cry crz cyb cyc cye cyo cyr cz- czc cze czo 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 erz eyc eye eyo eyr eze ezo ezr ezz ob- obb obc obe obo obr oby oc- ocb occ oco ocr ocz oeb oec oee oeo oer oey oo- oob ooc ooo oor or- orb orc ore oro orr ory orz oye oyo oze ozo ozz rbb rbc rbe rbo rbr rcb rcc rce rco rcr re- reb rec ree reo rer rey rez rob roc roe roo ror roy roz rrb rrc rrr ry- ryc rye ryo ryr ryy ryz rzb rze rzo rzy ybc ybe ybr yby ybz ycc yce yco ycy yeb yec yee yeo yer yey yez yob yoc yoe yoo yor yoy yrc yre yro yyb yyc yye yyy yyz yzb yzr yzy zbb zbc zbr zby zce zco zeb zec zee zeo zer zez zo- zob zoc zoe zoo zor zro zzr zzy zzz