-ey b-u bbb bbc bbe bbu bby bcb bcc bce bcu bcy be- beb bec bee beu bey bub buc bue buu buy by- byc bye byu c-- cbb cbc cbe cbu cby ccb ccc cce ccu ce- ceb cec cee ceu cey cub cuc cue cuu cuy cyb cyc cye ebb ebc ebe ebu eby ec- ecb ecc ece ecu eeb eec eee eey eu- eub euc eue eyc eye ubb ubc ube ubu uby ucb ucc uce ucu ueb uec uee uey uuc uue uuu uyc uyu ybc ybe yby ycc yce ycu ycy yeb yec yee yey yue yuu yuy yyb yyc yye yyu yyy