b-u bbb bbc bbe bbl bbu bcb bcc bce bcl bcu be- beb bec bee bel beu blb blc ble bll blu bub buc bue bul buu c-- cbb cbc cbe cbl cbu ccb ccc cce ccl ccu ce- ceb cec cee cel ceu cl- clb clc cle cll clu cub cuc cue cul cuu ebb ebc ebe ebl ebu ec- ecb ecc ece ecl ecu eeb eec eee eel elb elc ele ell elu eu- eub euc eue eul lbb lbc lbe lbl lbu lcb lcc lce lcl lcu leb lec lee lel leu llb llc lle lll llu lub luc lue lul luu ubb ubc ube ubl ubu ucb ucc uce ucl ucu ueb uec uee uel ulb ulc ule ull ulu uuc uue uuu