bbb bbd bbi bbn bbr bdb bdd bdi bdr bi- bib bid bii bin bir bnb bnd bni bnn bnr brb brd bri brn brr dbb dbd dbi dbn dbr ddb ddd ddi ddn ddr di- dib did dii din dir dnb dnd dni dnn dnr drb drd dri drn drr i-d ibb ibd ibi ibn ibr idb idd idi idn idr iib iid iii iin iir in- inb ind ini inn inr ir- irb ird iri irn irr n-i nbb nbd nbi nbn nbr ndb ndd ndi ndn ndr nib nid nii nin nir nnb nni nnn nrb nrd nri nrn nrr rbb rbd rbi rbn rbr rdb rdd rdi rdn rdr rib rid rii rin rir rnb rnd rni rnn rnr rrb rrd rri rrn rrr