b-u bbb bbc bbd bbe bbf bbu bcb bcc bcd bce bcf bcu bdb bdc bdd bde bdf bdu be- beb bec bed bee bef beu bfb bfc bfd bfe bff bfu bub buc bud bue buf buu c-- cbb cbc cbd cbe cbf cbu ccb ccc ccd cce ccf ccu cdb cdc cdd cde cdf cdu ce- ceb cec ced cee cef ceu cfb cfc cfd cfe cff cfu cub cuc cud cue cuf cuu dbb dbc dbd dbe dbf dbu dcb dcc dcd dce dcf dcu ddb ddc ddd dde ddf ddu de- deb dec ded dee def deu dfb dfc dfd dfe dff dfu dub duc dud due duf ebb ebc ebd ebe ebf ebu ec- ecb ecc ecd ece ecf ecu ed- edb edc edd ede edf edu eeb eec eed eee eef ef- efb efc efd efe eff eu- eub euc eud eue euf fbb fbc fbd fbe fbf fbu fcb fcc fcd fce fcf fcu fdb fdc fdd fde fdf fdu feb fec fed fee fef feu ffc ffd ffe fff ffu fub fud fue fuf fuu ubb ubc ube ubf ubu ucb ucc ucd uce ucf ucu udb udc udd ude udf udu ueb uec ued uee uef ufc ufd ufe uff ufu uuc uue uuu