-ic b-u bbb bbc bbd bbi bbn bbr bbu bcb bcc bcd bci bcn bcr bcu bdb bdc bdd bdi bdr bdu bi- bib bic bid bii bin bir biu bnb bnc bnd bni bnn bnr bnu brb brd bri brn brr bru bub buc bud bui bun bur buu c-- cbb cbc cbd cbi cbn cbr cbu ccb ccc ccd cci ccn ccr ccu cdb cdc cdd cdi cdn cdr cdu ci- cib cic cid cii cin cir ciu cn- cnb cnc cnd cni cnn cnr cnu crb crc crd cri crn crr cru cub cuc cud cui cun cur cuu dbb dbc dbd dbi dbn dbr dbu dcb dcc dcd dci dcn dcr dcu ddb ddc ddd ddi ddn ddr ddu di- dib dic did dii din dir diu dnb dnc dnd dni dnn dnr drb drc drd dri drn drr dru dub duc dud dui dun dur i-d ibb ibc ibd ibi ibn ibr ibu icb icc icd ici icn icr icu idb idc idd idi idn idr idu iib iic iid iii iin iir iiu in- inb inc ind ini inn inr inu ir- irb irc ird iri irn irr iru iu- iub iuc iud iui iur n-i nbb nbc nbd nbi nbn nbr nbu ncb ncc ncd nci ncn ncr ncu ndb ndc ndd ndi ndn ndr ndu nib nic nid nii nin nir niu nnb nnc nni nnn nnu nrb nrc nrd nri nrn nrr nru nub nuc nud nui nun nur nuu rbb rbc rbd rbi rbn rbr rbu rcb rcc rcd rci rcn rcr rcu rdb rdc rdd rdi rdn rdr rdu rib ric rid rii rin rir rnb rnc rnd rni rnn rnr rnu rrb rrc rrd rri rrn rrr rru rub ruc rud rui run rur ruu ubb ubc ubi ubn ubr ubu ucb ucc ucd uci ucn ucr ucu udb udc udd udi udn udr udu uib uic uid uii uin uir uiu un- unb unc und uni unn unr unu ur- urb urc urd uri urn urr uru uuc uun uur uuu