-er -ey bbb bbc bbe bbk bbn bbo bbr bby bcb bcc bce bck bcn bco bcr bcy be- beb bec bee bek ben beo ber bey bkb bkc bke bkk bkn bko bkr bnb bnc bne bnk bnn bno bnr bob boc boe bok bon boo bor boy brb bre brk brn bro brr bry by- byc bye byk byn byo byr c-- cbb cbc cbe cbk cbn cbo cbr cby ccb ccc cce cck ccn cco ccr ce- ceb cec cee cek cen ceo cer cey ckb ckc cko cky cn- cnb cnc cne cnn cno cnr cny co- cob coc coe cok con coo cor coy crb crc cre crk crn cro crr cry cyb cyc cye cyk cyn cyo cyr ebb ebc ebe ebk ebn ebo ebr eby ec- ecb ecc ece eck ecn eco ecr eeb eec eee eek een eeo eer eey ekb ekc eke eko ekr eky en- enb enc ene enk enn eno enr eny eo- eob eoc eoe eok eon eoo eor erb erc ere erk ern ero err ery eyc eye eyn eyo eyr kbb kbc kbe kbk kbn kbo kbr kcb kcc kce kck kcn kcr ke- keb kec kee kek ken keo ker key kkb kkc kke kkk kkn kkr kky kn- knc kne knk knn kno knr kob koc koe kok kon koo kor koy krc krk krn kro krr kry kyc kye kyn kyo kyr nbb nbc nbe nbk nbn nbo nbr ncb ncc nce nck ncn nco ncr ne- neb nec nee nek nen neo ner ney nkc nke nkk nkn nko nkr nky nnb nnc nne nnk nnn nno no- nob noc noe nok non noo nor noy nrb nrc nre nrk nrn nro nrr nry nyc nye nyk nyn nyo nyy ob- obb obc obe obk obn obo obr oby oc- ocb occ ock ocn oco ocr oeb oec oee oen oeo oer oey okb okc oke okk oko okr on- onb onc one onk onn ono onr ony oo- oob ooc ook oon ooo oor or- orb orc ore ork orn oro orr ory oye oyo rbb rbc rbe rbk rbn rbo rbr rcb rcc rce rcn rco rcr re- reb rec ree rek ren reo rer rey rkb rkc rke rkk rko rky rnb rnc rnn rno rnr rny rob roc roe rok ron roo ror roy rrb rrc rrk rrn rrr ry- ryc rye ryk ryn ryo ryr ryy ybc ybe ybr yby ycc yce yco ycy yeb yec yee yek yen yeo yer yey ykk ykn yne ynk ynn yny yob yoc yoe yok yon yoo yor yoy yrc yre yrn yro yyb yyc yye yyy