b-u bbb bbc bbe bbk bbn bbt bbu bcb bcc bce bck bcn bct bcu be- beb bec bee bek ben bet beu bkb bkc bke bkk bkn bkt bnb bnc bne bnk bnn bnt bnu btb btc bte btk btn btt btu bub buc bue buk bun but buu c-- cbb cbc cbe cbk cbn cbt cbu ccb ccc cce cck ccn cct ccu ce- ceb cec cee cek cen cet ceu ckb ckc ckt cn- cnb cnc cne cnn cnt cnu ctb ctc cte ctk ctn ctt ctu cub cuc cue cuk cun cut cuu ebb ebc ebe ebk ebn ebt ebu ec- ecb ecc ece eck ecn ect ecu eeb eec eee eek een eet ekb ekc eke ekt eku en- enb enc ene enk enn ent enu etb etc ete etk etn ett etu eu- eub euc eue eun eut k-t kbb kbc kbe kbk kbn kbu kcb kcc kce kck kcn kct kcu ke- keb kec kee kek ken ket kkb kkc kke kkk kkn kkt kku kn- knc kne knk knn knt knu ktb ktc kte ktk ktn ktt ktu kub kuc kue kuk kun kut kuu nbb nbc nbe nbk nbn nbt nbu ncb ncc nce nck ncn nct ncu ne- neb nec nee nek nen net neu nkc nke nkk nkn nkt nku nnb nnc nne nnk nnn nnt nnu ntb ntc nte ntk ntn ntt ntu nub nuc nue nuk nun nut nuu tbb tbc tbe tbk tbn tbt tbu tcb tcc tce tck tcn tct tcu te- teb tec tee tek ten tet teu tkb tkc tke tkk tkt tnb tnc tne tnk tnn tnt ttb ttc tte ttk ttn ttt ttu tub tuc tue tuk tun tut tuu ubb ubc ube ubk ubn ubt ubu ucb ucc uce uck ucn uct ucu ueb uec uee uen uet ukb ukc uke ukk ukn uku un- unb unc une unk unn unt unu utb utc ute utk utn utt utu uuc uue uun uut uuu