b-u bbb bbc bbe bbf bbk bbt bbu bcb bcc bce bcf bck bct bcu bcz be- beb bec bee bef bek bet beu bez bfb bfc bfe bff bft bfu bfz bkb bkc bke bkf bkk bkt btb btc bte btf btk btt btu btz bub buc bue buf buk but buu buz bze bzf bzu bzz c-- cbb cbc cbe cbf cbk cbt cbu cbz ccb ccc cce ccf cck cct ccu ccz ce- ceb cec cee cef cek cet ceu cez cfb cfc cfe cff cfk cft cfu cfz ckb ckc ckt ctb ctc cte ctf ctk ctt ctu ctz cub cuc cue cuf cuk cut cuu cuz cz- czc cze czk czt ebb ebc ebe ebf ebk ebt ebu ec- ecb ecc ece ecf eck ect ecu eeb eec eee eef eek eet ef- efb efc efe eff eft ekb ekc eke ekf ekt eku etb etc ete etf etk ett etu etz eu- eub euc eue euf eut eze ezf ezz fbb fbc fbe fbf fbk fbt fbu fcb fcc fce fcf fck fct fcu fcz feb fec fee fef fek fet feu fez ffc ffe fff ffk fft ffu ffz fkb fkc fkf fkk fkt ftb ftc fte ftf ftk ftt ftu ftz fub fue fuf fuk fut fuu k-t k-z kbb kbc kbe kbf kbk kbu kbz kcb kcc kce kck kct kcu ke- keb kec kee kef kek ket kez kfc kff kfu kkb kkc kke kkk kkt kku ktb ktc kte ktf ktk ktt ktu kub kuc kue kuk kut kuu tbb tbc tbe tbf tbk tbt tbu tbz tcb tcc tce tcf tck tct tcu te- teb tec tee tef tek tet teu tez tfb tfc tfe tff tfk tft tfu tkb tkc tke tkk tkt tkz ttb ttc tte ttf ttk ttt ttu tub tuc tue tuf tuk tut tuu tuz tze tzf tzu ubb ubc ube ubf ubk ubt ubu ucb ucc uce ucf uck uct ucu ueb uec uee uef uet ufc ufe uff uft ufu ukb ukc uke ukf ukk uku ukz utb utc ute utf utk utt utu utz uuc uue uut uuu uzb uzu zbb zbc zbt zce zeb zec zee zef zek zet zez zfc zte zub zuc zuk zut zuz zzt zzz