b-u bbb bbc bbe bbk bbl bbu bcb bcc bce bck bcl bcu be- beb bec bee bek bel beu bkb bkc bke bkk bkl blb blc ble blk bll blu bub buc bue buk bul buu c-- cbb cbc cbe cbk cbl cbu ccb ccc cce cck ccl ccu ce- ceb cec cee cek cel ceu ckb ckc cl- clb clc cle clk cll clu cub cuc cue cuk cul cuu ebb ebc ebe ebk ebl ebu ec- ecb ecc ece eck ecl ecu eeb eec eee eek eel ekb ekc eke ekl eku elb elc ele elk ell elu eu- eub euc eue eul kbb kbc kbe kbk kbl kbu kcb kcc kce kck kcl kcu ke- keb kec kee kek kel kkb kkc kke kkk kkl kku kl- klb klc klu kub kuc kue kuk kul kuu lbb lbc lbe lbk lbl lbu lcb lcc lce lck lcl lcu leb lec lee lek lel leu lkb lkl llb llc lle llk lll llu lub luc lue luk lul luu ubb ubc ube ubk ubl ubu ucb ucc uce uck ucl ucu ueb uec uee uel ukb ukc uke ukk ukl uku ulb ulc ule ulk ull ulu uuc uue uuu