b-u bbb bbc bbe bbf bbk bbl bbu bcb bcc bce bcf bck bcl bcu be- beb bec bee bef bek bel beu bfb bfc bfe bff bfl bfu bkb bkc bke bkf bkk bkl blb blc ble blf blk bll blu bub buc bue buf buk bul buu c-- cbb cbc cbe cbf cbk cbl cbu ccb ccc cce ccf cck ccl ccu ce- ceb cec cee cef cek cel ceu cfb cfc cfe cff cfk cfl cfu ckb ckc cl- clb clc cle clf clk cll clu cub cuc cue cuf cuk cul cuu ebb ebc ebe ebf ebk ebl ebu ec- ecb ecc ece ecf eck ecl ecu eeb eec eee eef eek eel ef- efb efc efe eff efl ekb ekc eke ekf ekl eku elb elc ele elf elk ell elu eu- eub euc eue euf eul fbb fbc fbe fbf fbk fbl fbu fcb fcc fce fcf fck fcl fcu feb fec fee fef fek fel feu ffc ffe fff ffk ffl ffu fkb fkc fkf fkk fkl flb flc fle flf fll flu fub fue fuf fuk ful fuu kbb kbc kbe kbf kbk kbl kbu kcb kcc kce kck kcl kcu ke- keb kec kee kef kek kel kfc kff kfu kkb kkc kke kkk kkl kku kl- klb klc klf klu kub kuc kue kuk kul kuu lbb lbc lbe lbf lbk lbl lbu lcb lcc lce lcf lck lcl lcu leb lec lee lef lek lel leu lfb lfc lfe lff lfk lfl lfu lkb lkl llb llc lle llf llk lll llu lub luc lue luf luk lul luu ubb ubc ube ubf ubk ubl ubu ucb ucc uce ucf uck ucl ucu ueb uec uee uef uel ufc ufe uff ufl ufu ukb ukc uke ukf ukk ukl uku ulb ulc ule ulf ulk ull ulu uuc uue uuu