-er bbb bbe bbi bbk bbn bbr be- beb bee bei bek ben ber bi- bib bie bii bik bin bir bkb bke bkk bkn bkr bnb bne bni bnk bnn bnr brb bre bri brk brn brr ebb ebe ebi ebk ebn ebr eeb eee eek een eer eib eie eii eik ein eir ekb eke eki ekr en- enb ene eni enk enn enr erb ere eri erk ern err ibb ibe ibi ibk ibn ibr ie- iee iei iek ien ier iib iie iii iin iir ikb ike iki ikk ikr in- inb ine ini ink inn inr ir- irb ire iri irk irn irr kbb kbe kbi kbk kbn kbr ke- keb kee kei kek ken ker kib kie kii kik kin kir kkb kke kki kkk kkn kkr kn- kne kni knk knn knr kri krk krn krr n-i nbb nbe nbi nbk nbn nbr ne- neb nee nei nek nen ner nib nie nii nik nin nir nke nki nkk nkn nkr nnb nne nni nnk nnn nrb nre nri nrk nrn nrr rbb rbe rbi rbk rbn rbr re- reb ree rei rek ren rer rib rie rii rik rin rir rkb rke rkk rnb rni rnn rnr rrb rri rrk rrn rrr