-er -ic bbb bbc bbe bbi bbr bcb bcc bce bci bcr be- beb bec bee bei ber bi- bib bic bie bii bir brb bre bri brr c-- cbb cbc cbe cbi cbr ccb ccc cce cci ccr ce- ceb cec cee cei cer ci- cib cic cie cii cir crb crc cre cri crr ebb ebc ebe ebi ebr ec- ecb ecc ece eci ecr eeb eec eee eer eib eic eie eii eir erb erc ere eri err ibb ibc ibe ibi ibr icb icc ice ici icr ie- iec iee iei ier iib iic iie iii iir ir- irb irc ire iri irr rbb rbc rbe rbi rbr rcb rcc rce rci rcr re- reb rec ree rei rer rib ric rie rii rir rrb rrc rri rrr