-er -ic b-u bbb bbc bbe bbi bbr bbu bcb bcc bce bci bcr bcu be- beb bec bee bei ber beu bi- bib bic bie bii bir biu brb bre bri brr bru bub buc bue bui bur buu c-- cbb cbc cbe cbi cbr cbu ccb ccc cce cci ccr ccu ce- ceb cec cee cei cer ceu ci- cib cic cie cii cir ciu crb crc cre cri crr cru cub cuc cue cui cur cuu ebb ebc ebe ebi ebr ebu ec- ecb ecc ece eci ecr ecu eeb eec eee eer eib eic eie eii eir eiu erb erc ere eri err eru eu- eub euc eue eui eur ibb ibc ibe ibi ibr ibu icb icc ice ici icr icu ie- iec iee iei ier iib iic iie iii iir iiu ir- irb irc ire iri irr iru iu- iub iuc iue iui iur rbb rbc rbe rbi rbr rbu rcb rcc rce rci rcr rcu re- reb rec ree rei rer reu rib ric rie rii rir rrb rrc rri rrr rru rub ruc rue rui rur ruu ubb ubc ube ubi ubr ubu ucb ucc uce uci ucr ucu ueb uec uee uei uer uib uic uie uii uir uiu ur- urb urc ure uri urr uru uuc uue uur uuu