b-u bbb bbe bbi bbk bbl bbn bbu bbx be- beb bee bei bek bel ben beu bex bi- bib bie bii bik bil bin biu bix bkb bke bkk bkl bkn bkx blb ble bli blk bll bln blu blx bnb bne bni bnk bnl bnn bnu bnx bub bue bui buk bul bun buu bux bxb bxi bxl bxn bxx ebb ebe ebi ebk ebl ebn ebu ebx eeb eee eek eel een eex eib eie eii eik eil ein eiu eix ekb eke eki ekl eku elb ele eli elk ell eln elu elx en- enb ene eni enk enl enn enu eu- eub eue eui eul eun eux ex- exe exi exl exu exx ibb ibe ibi ibk ibl ibn ibu ibx ie- iee iei iek iel ien iex iib iie iii iil iin iiu iix ikb ike iki ikk ikl iku ikx il- ilb ile ili ilk ill iln ilu ilx in- inb ine ini ink inl inn inu inx iu- iub iue iui ixe ixi ixl ixn kbb kbe kbi kbk kbl kbn kbu kbx ke- keb kee kei kek kel ken kex kib kie kii kik kil kin kiu kix kkb kke kki kkk kkl kkn kku kl- klb kli klu klx kn- kne kni knk knl knn knu knx kub kue kui kuk kul kun kuu kxl lbb lbe lbi lbk lbl lbu lbx leb lee lei lek lel len leu lex lib lie lii lik lil lin liu lix lkb lkl llb lle lli llk lll lln llu lnb lne lni lnk lnl lnn lnu lub lue lui luk lul lun luu lux lxi lxx n-i nbb nbe nbi nbk nbl nbn nbu nbx ne- neb nee nei nek nel nen neu nex nib nie nii nik nil nin niu nix nke nki nkk nkn nku nlb nle nli nlk nll nln nlu nlx nnb nne nni nnk nnl nnn nnu nub nue nui nuk nul nun nuu nux nxl ubb ube ubi ubk ubl ubn ubu ubx ueb uee uei uel uen uib uie uii uil uin uiu ukb uke uki ukk ukl ukn uku ulb ule uli ulk ull uln ulu un- unb une uni unk unl unn unu unx uue uun uuu uxb uxu xbe xbl xbx xee xel xen xeu xex xie xii xin xiu xix xkb xke xkl xlb xli xnk xnu xue xui xul xun xxi xxl xxx