-er -ey b-u bbb bbc bbe bbr bbu bby bcb bcc bce bcr bcu bcy be- beb bec bee ber beu bey brb bre brr bru bry bub buc bue bur buu buy by- byc bye byr byu c-- cbb cbc cbe cbr cbu cby ccb ccc cce ccr ccu ce- ceb cec cee cer ceu cey crb crc cre crr cru cry cub cuc cue cur cuu cuy cyb cyc cye cyr ebb ebc ebe ebr ebu eby ec- ecb ecc ece ecr ecu eeb eec eee eer eey erb erc ere err eru ery eu- eub euc eue eur eyc eye eyr rbb rbc rbe rbr rbu rcb rcc rce rcr rcu re- reb rec ree rer reu rey rrb rrc rrr rru rub ruc rue rur ruu ruy ry- ryc rye ryr ryu ryy ubb ubc ube ubr ubu uby ucb ucc uce ucr ucu ueb uec uee uer uey ur- urb urc ure urr uru ury uuc uue uur uuu uyc uyu ybc ybe ybr yby ycc yce ycu ycy yeb yec yee yer yey yrc yre yru yue yur yuu yuy yyb yyc yye yyu yyy