bbb bbe bbf bbi bbk bbn be- beb bee bef bei bek ben bfb bfe bff bfi bfn bi- bib bie bif bii bik bin bkb bke bkf bkk bkn bnb bne bnf bni bnk bnn ebb ebe ebf ebi ebk ebn eeb eee eef eek een ef- efb efe eff efi eib eie eif eii eik ein ekb eke ekf eki en- enb ene enf eni enk enn fbb fbe fbf fbi fbk fbn feb fee fef fei fek fen ffe fff ffi ffk ffn fib fie fif fii fik fin fkb fkf fki fkk fnb fne fnf fni fnk fnn i-f ibb ibe ibf ibi ibk ibn ie- iee ief iei iek ien ifb ife iff ifi ifn iib iie iif iii iin ikb ike ikf iki ikk in- inb ine inf ini ink inn kbb kbe kbf kbi kbk kbn ke- keb kee kef kei kek ken kff kfi kib kie kif kii kik kin kkb kke kki kkk kkn kn- kne knf kni knk knn n-i nbb nbe nbf nbi nbk nbn ne- neb nee nef nei nek nen nfb nfe nff nfi nfk nfn nib nie nif nii nik nin nke nkf nki nkk nkn nnb nne nnf nni nnk nnn