-er -ey b-u bbb bbc bbe bbk bbo bbr bbu bby bcb bcc bce bck bco bcr bcu bcy be- beb bec bee bek beo ber beu bey bkb bkc bke bkk bko bkr bob boc boe bok boo bor bou boy brb bre brk bro brr bru bry bub buc bue buk buo bur buu buy by- byc bye byk byo byr byu c-- cbb cbc cbe cbk cbo cbr cbu cby ccb ccc cce cck cco ccr ccu ce- ceb cec cee cek ceo cer ceu cey ckb ckc cko cky co- cob coc coe cok coo cor cou coy crb crc cre crk cro crr cru cry cub cuc cue cuk cuo cur cuu cuy cyb cyc cye cyk cyo cyr ebb ebc ebe ebk ebo ebr ebu eby ec- ecb ecc ece eck eco ecr ecu eeb eec eee eek eeo eer eey ekb ekc eke eko ekr eku eky eo- eob eoc eoe eok eoo eor eou erb erc ere erk ero err eru ery eu- eub euc eue eur eyc eye eyo eyr kbb kbc kbe kbk kbo kbr kbu kcb kcc kce kck kcr kcu ke- keb kec kee kek keo ker key kkb kkc kke kkk kkr kku kky kob koc koe kok koo kor kou koy krc krk kro krr kru kry kub kuc kue kuk kur kuu kuy kyc kye kyo kyr kyu ob- obb obc obe obk obo obr obu oby oc- ocb occ ock oco ocr ocu oeb oec oee oeo oer oey okb okc oke okk oko okr oku oo- oob ooc ook ooo oor or- orb orc ore ork oro orr oru ory ou- ouc oue ouk ouo our oye oyo rbb rbc rbe rbk rbo rbr rbu rcb rcc rce rco rcr rcu re- reb rec ree rek reo rer reu rey rkb rkc rke rkk rko rku rky rob roc roe rok roo ror rou roy rrb rrc rrk rrr rru rub ruc rue ruk ruo rur ruu ruy ry- ryc rye ryk ryo ryr ryu ryy ubb ubc ube ubk ubo ubr ubu uby ucb ucc uce uck uco ucr ucu ueb uec uee uer uey ukb ukc uke ukk ukr uku uob uoc uoe uok uoo uor ur- urb urc ure urk uro urr uru ury uuc uue uur uuu uyc uyo uyu ybc ybe ybr yby ycc yce yco ycu ycy yeb yec yee yek yeo yer yey ykk yob yoc yoe yok yoo yor you yoy yrc yre yro yru yue yuk yuo yur yuu yuy yyb yyc yye yyu yyy