-er -ic b-u bbb bbc bbd bbe bbi bbr bbu bcb bcc bcd bce bci bcr bcu bdb bdc bdd bde bdi bdr bdu be- beb bec bed bee bei ber beu bi- bib bic bid bie bii bir biu brb brd bre bri brr bru bub buc bud bue bui bur buu c-- cbb cbc cbd cbe cbi cbr cbu ccb ccc ccd cce cci ccr ccu cdb cdc cdd cde cdi cdr cdu ce- ceb cec ced cee cei cer ceu ci- cib cic cid cie cii cir ciu crb crc crd cre cri crr cru cub cuc cud cue cui cur cuu dbb dbc dbd dbe dbi dbr dbu dcb dcc dcd dce dci dcr dcu ddb ddc ddd dde ddi ddr ddu de- deb dec ded dee dei der deu di- dib dic did die dii dir diu drb drc drd dre dri drr dru dub duc dud due dui dur ebb ebc ebd ebe ebi ebr ebu ec- ecb ecc ecd ece eci ecr ecu ed- edb edc edd ede edi edr edu eeb eec eed eee eer eib eic eid eie eii eir eiu erb erc erd ere eri err eru eu- eub euc eud eue eui eur i-d ibb ibc ibd ibe ibi ibr ibu icb icc icd ice ici icr icu idb idc idd ide idi idr idu ie- iec ied iee iei ier iib iic iid iie iii iir iiu ir- irb irc ird ire iri irr iru iu- iub iuc iud iue iui iur rbb rbc rbd rbe rbi rbr rbu rcb rcc rcd rce rci rcr rcu rdb rdc rdd rde rdi rdr rdu re- reb rec red ree rei rer reu rib ric rid rie rii rir rrb rrc rrd rri rrr rru rub ruc rud rue rui rur ruu ubb ubc ube ubi ubr ubu ucb ucc ucd uce uci ucr ucu udb udc udd ude udi udr udu ueb uec ued uee uei uer uib uic uid uie uii uir uiu ur- urb urc urd ure uri urr uru uuc uue uur uuu