b-u bbb bbc bbe bbk bbl bbt bbu bcb bcc bce bck bcl bct bcu be- beb bec bee bek bel bet beu bkb bkc bke bkk bkl bkt blb blc ble blk bll blt blu btb btc bte btk btl btt btu bub buc bue buk bul but buu c-- cbb cbc cbe cbk cbl cbt cbu ccb ccc cce cck ccl cct ccu ce- ceb cec cee cek cel cet ceu ckb ckc ckt cl- clb clc cle clk cll clt clu ctb ctc cte ctk ctl ctt ctu cub cuc cue cuk cul cut cuu ebb ebc ebe ebk ebl ebt ebu ec- ecb ecc ece eck ecl ect ecu eeb eec eee eek eel eet ekb ekc eke ekl ekt eku elb elc ele elk ell elt elu etb etc ete etk etl ett etu eu- eub euc eue eul eut k-t kbb kbc kbe kbk kbl kbu kcb kcc kce kck kcl kct kcu ke- keb kec kee kek kel ket kkb kkc kke kkk kkl kkt kku kl- klb klc klt klu ktb ktc kte ktk ktl ktt ktu kub kuc kue kuk kul kut kuu lbb lbc lbe lbk lbl lbt lbu lcb lcc lce lck lcl lct lcu leb lec lee lek lel let leu lkb lkl lkt llb llc lle llk lll llt llu ltb ltc lte ltk ltl ltt ltu lub luc lue luk lul lut luu tbb tbc tbe tbk tbl tbt tbu tcb tcc tce tck tcl tct tcu te- teb tec tee tek tel tet teu tkb tkc tke tkk tkl tkt tlc tle tlk tll tlt tlu ttb ttc tte ttk ttl ttt ttu tub tuc tue tuk tul tut tuu ubb ubc ube ubk ubl ubt ubu ucb ucc uce uck ucl uct ucu ueb uec uee uel uet ukb ukc uke ukk ukl uku ulb ulc ule ulk ull ult ulu utb utc ute utk utl utt utu uuc uue uut uuu