b-u bbb bbc bbe bbk bbn bbu bcb bcc bce bck bcn bcu be- beb bec bee bek ben beu bkb bkc bke bkk bkn bnb bnc bne bnk bnn bnu bub buc bue buk bun buu c-- cbb cbc cbe cbk cbn cbu ccb ccc cce cck ccn ccu ce- ceb cec cee cek cen ceu ckb ckc cn- cnb cnc cne cnn cnu cub cuc cue cuk cun cuu ebb ebc ebe ebk ebn ebu ec- ecb ecc ece eck ecn ecu eeb eec eee eek een ekb ekc eke eku en- enb enc ene enk enn enu eu- eub euc eue eun kbb kbc kbe kbk kbn kbu kcb kcc kce kck kcn kcu ke- keb kec kee kek ken kkb kkc kke kkk kkn kku kn- knc kne knk knn knu kub kuc kue kuk kun kuu nbb nbc nbe nbk nbn nbu ncb ncc nce nck ncn ncu ne- neb nec nee nek nen neu nkc nke nkk nkn nku nnb nnc nne nnk nnn nnu nub nuc nue nuk nun nuu ubb ubc ube ubk ubn ubu ucb ucc uce uck ucn ucu ueb uec uee uen ukb ukc uke ukk ukn uku un- unb unc une unk unn unu uuc uue uun uuu