b-u bbb bbd bbi bbn bbr bbu bdb bdd bdi bdr bdu bi- bib bid bii bin bir biu bnb bnd bni bnn bnr bnu brb brd bri brn brr bru bub bud bui bun bur buu dbb dbd dbi dbn dbr dbu ddb ddd ddi ddn ddr ddu di- dib did dii din dir diu dnb dnd dni dnn dnr drb drd dri drn drr dru dub dud dui dun dur i-d ibb ibd ibi ibn ibr ibu idb idd idi idn idr idu iib iid iii iin iir iiu in- inb ind ini inn inr inu ir- irb ird iri irn irr iru iu- iub iud iui iur n-i nbb nbd nbi nbn nbr nbu ndb ndd ndi ndn ndr ndu nib nid nii nin nir niu nnb nni nnn nnu nrb nrd nri nrn nrr nru nub nud nui nun nur nuu rbb rbd rbi rbn rbr rbu rdb rdd rdi rdn rdr rdu rib rid rii rin rir rnb rnd rni rnn rnr rnu rrb rrd rri rrn rrr rru rub rud rui run rur ruu ubb ubi ubn ubr ubu udb udd udi udn udr udu uib uid uii uin uir uiu un- unb und uni unn unr unu ur- urb urd uri urn urr uru uun uur uuu