-er -ic bbb bbc bbe bbi bbm bbr bcb bcc bce bci bcm bcr be- beb bec bee bei bem ber bi- bib bic bie bii bim bir bmb bmc bme bmi bmm bmr brb bre bri brm brr c-- cbb cbc cbe cbi cbm cbr ccb ccc cce cci ccm ccr ce- ceb cec cee cei cem cer ci- cib cic cie cii cim cir cmb cmc cme cmi cmm cmr crb crc cre cri crm crr ebb ebc ebe ebi ebm ebr ec- ecb ecc ece eci ecm ecr eeb eec eee eem eer eib eic eie eii eim eir em- emb emc eme emi emm emr erb erc ere eri erm err ibb ibc ibe ibi ibm ibr icb icc ice ici icm icr ie- iec iee iei iem ier iib iic iie iii iim iir im- imb imc ime imi imm ir- irb irc ire iri irm irr m-r mbb mbc mbe mbi mbm mbr mc- mcb mcc mce mci mcm mcr meb mec mee mei mem mer mi- mib mic mie mii mim mir mmb mmc mme mmi mmm mmr mrb mrc mre mri mrm mrr rbb rbc rbe rbi rbm rbr rcb rcc rce rci rcm rcr re- reb rec ree rei rem rer rib ric rie rii rim rir rmb rmc rme rmi rmm rmr rrb rrc rri rrm rrr