-er -ey b-u bbb bbc bbe bbr bbt bbu bby bcb bcc bce bcr bct bcu bcy be- beb bec bee ber bet beu bey brb bre brr brt bru bry btb btc bte btr btt btu bty bub buc bue bur but buu buy by- byc bye byr byt byu c-- cbb cbc cbe cbr cbt cbu cby ccb ccc cce ccr cct ccu ce- ceb cec cee cer cet ceu cey crb crc cre crr crt cru cry ctb ctc cte ctr ctt ctu cty cub cuc cue cur cut cuu cuy cyb cyc cye cyr cyt ebb ebc ebe ebr ebt ebu eby ec- ecb ecc ece ecr ect ecu eeb eec eee eer eet eey erb erc ere err ert eru ery etb etc ete etr ett etu ety eu- eub euc eue eur eut eyc eye eyr eyt rbb rbc rbe rbr rbt rbu rcb rcc rce rcr rct rcu re- reb rec ree rer ret reu rey rrb rrc rrr rrt rru rtb rtc rte rtr rtt rtu rty rub ruc rue rur rut ruu ruy ry- ryc rye ryr ryu ryy tbb tbc tbe tbr tbt tbu tcb tcc tce tcr tct tcu te- teb tec tee ter tet teu tey trb trc tre trr trt tru try ttb ttc tte ttr ttt ttu tty tub tuc tue tur tut tuu tuy tyc tye tyr tyt ubb ubc ube ubr ubt ubu uby ucb ucc uce ucr uct ucu ueb uec uee uer uet uey ur- urb urc ure urr urt uru ury utb utc ute utr utt utu uty uuc uue uur uut uuu uyc uyu ybc ybe ybr yby ycc yce ycu ycy yeb yec yee yer yet yey yrc yre yrt yru ytc yte ytr ytt ytu yue yur yut yuu yuy yyb yyc yye yyt yyu yyy