b-u bbb bbc bbd bbe bbk bbl bbu bcb bcc bcd bce bck bcl bcu bdb bdc bdd bde bdk bdl bdu be- beb bec bed bee bek bel beu bkb bkc bke bkk bkl blb blc bld ble blk bll blu bub buc bud bue buk bul buu c-- cbb cbc cbd cbe cbk cbl cbu ccb ccc ccd cce cck ccl ccu cdb cdc cdd cde cdk cdl cdu ce- ceb cec ced cee cek cel ceu ckb ckc ckd cl- clb clc cld cle clk cll clu cub cuc cud cue cuk cul cuu dbb dbc dbd dbe dbk dbl dbu dcb dcc dcd dce dck dcl dcu ddb ddc ddd dde ddk ddl ddu de- deb dec ded dee dek del deu dkb dkc dke dkk dkl dku dl- dlb dlc dld dle dlk dll dlu dub duc dud due duk dul ebb ebc ebd ebe ebk ebl ebu ec- ecb ecc ecd ece eck ecl ecu ed- edb edc edd ede edk edl edu eeb eec eed eee eek eel ekb ekc ekd eke ekl eku elb elc eld ele elk ell elu eu- eub euc eud eue eul kbb kbc kbd kbe kbk kbl kbu kcb kcc kcd kce kck kcl kcu kdb kdc kde kdk kdl kdu ke- keb kec ked kee kek kel kkb kkc kke kkk kkl kku kl- klb klc kld klu kub kuc kud kue kuk kul kuu lbb lbc lbd lbe lbk lbl lbu lcb lcc lcd lce lck lcl lcu ldb ldc ldd lde ldk ldl ldu leb lec led lee lek lel leu lkb lkl llb llc lld lle llk lll llu lub luc lud lue luk lul luu ubb ubc ube ubk ubl ubu ucb ucc ucd uce uck ucl ucu udb udc udd ude udk udl udu ueb uec ued uee uel ukb ukc uke ukk ukl uku ulb ulc uld ule ulk ull ulu uuc uue uuu