b-u bbb bbc bbe bbf bbk bbt bbu bcb bcc bce bcf bck bct bcu be- beb bec bee bef bek bet beu bfb bfc bfe bff bft bfu bkb bkc bke bkf bkk bkt btb btc bte btf btk btt btu bub buc bue buf buk but buu c-- cbb cbc cbe cbf cbk cbt cbu ccb ccc cce ccf cck cct ccu ce- ceb cec cee cef cek cet ceu cfb cfc cfe cff cfk cft cfu ckb ckc ckt ctb ctc cte ctf ctk ctt ctu cub cuc cue cuf cuk cut cuu 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 eu- eub euc eue euf eut fbb fbc fbe fbf fbk fbt fbu fcb fcc fce fcf fck fct fcu feb fec fee fef fek fet feu ffc ffe fff ffk fft ffu fkb fkc fkf fkk fkt ftb ftc fte ftf ftk ftt ftu fub fue fuf fuk fut fuu k-t kbb kbc kbe kbf kbk kbu kcb kcc kce kck kct kcu ke- keb kec kee kef kek ket 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 tcb tcc tce tcf tck tct tcu te- teb tec tee tef tek tet teu tfb tfc tfe tff tfk tft tfu tkb tkc tke tkk tkt ttb ttc tte ttf ttk ttt ttu tub tuc tue tuf tuk tut tuu 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 utb utc ute utf utk utt utu uuc uue uut uuu