-er -ey b-u bbb bbc bbe bbk bbr bbu bby bcb bcc bce bck bcr bcu bcy be- beb bec bee bek ber beu bey bkb bkc bke bkk bkr brb bre brk brr bru bry bub buc bue buk bur buu buy by- byc bye byk byr byu c-- cbb cbc cbe cbk cbr cbu cby ccb ccc cce cck ccr ccu ce- ceb cec cee cek cer ceu cey ckb ckc cky crb crc cre crk crr cru cry cub cuc cue cuk cur cuu cuy cyb cyc cye cyk cyr ebb ebc ebe ebk ebr ebu eby ec- ecb ecc ece eck ecr ecu eeb eec eee eek eer eey ekb ekc eke ekr eku eky erb erc ere erk err eru ery eu- eub euc eue eur eyc eye eyr kbb kbc kbe kbk kbr kbu kcb kcc kce kck kcr kcu ke- keb kec kee kek ker key kkb kkc kke kkk kkr kku kky krc krk krr kru kry kub kuc kue kuk kur kuu kuy kyc kye kyr kyu rbb rbc rbe rbk rbr rbu rcb rcc rce rcr rcu re- reb rec ree rek rer reu rey rkb rkc rke rkk rku rky rrb rrc rrk rrr rru rub ruc rue ruk rur ruu ruy ry- ryc rye ryk ryr ryu ryy ubb ubc ube ubk ubr ubu uby ucb ucc uce uck ucr ucu ueb uec uee uer uey ukb ukc uke ukk ukr uku ur- urb urc ure urk urr uru ury uuc uue uur uuu uyc uyu ybc ybe ybr yby ycc yce ycu ycy yeb yec yee yek yer yey ykk yrc yre yru yue yuk yur yuu yuy yyb yyc yye yyu yyy