-ic b-u bbb bbc bbd bbi bbr bbu bcb bcc bcd bci bcr bcu bdb bdc bdd bdi bdr bdu bi- bib bic bid bii bir biu brb brd bri brr bru bub buc bud bui bur buu c-- cbb cbc cbd cbi cbr cbu ccb ccc ccd cci ccr ccu cdb cdc cdd cdi cdr cdu ci- cib cic cid cii cir ciu crb crc crd cri crr cru cub cuc cud cui cur cuu dbb dbc dbd dbi dbr dbu dcb dcc dcd dci dcr dcu ddb ddc ddd ddi ddr ddu di- dib dic did dii dir diu drb drc drd dri drr dru dub duc dud dui dur i-d ibb ibc ibd ibi ibr ibu icb icc icd ici icr icu idb idc idd idi idr idu iib iic iid iii iir iiu ir- irb irc ird iri irr iru iu- iub iuc iud iui iur rbb rbc rbd rbi rbr rbu rcb rcc rcd rci rcr rcu rdb rdc rdd rdi rdr rdu rib ric rid rii rir rrb rrc rrd rri rrr rru rub ruc rud rui rur ruu ubb ubc ubi ubr ubu ucb ucc ucd uci ucr ucu udb udc udd udi udr udu uib uic uid uii uir uiu ur- urb urc urd uri urr uru uuc uur uuu