-er -ic bbb bbc bbe bbi bbm bbr bbs bcb bcc bce bci bcm bcr bcs be- beb bec bee bei bem ber bes bi- bib bic bie bii bim bir bis bmb bmc bme bmi bmm bmr bms brb bre bri brm brr brs bsb bsc bse bsi bsm bsr bss c-- cbb cbc cbe cbi cbm cbr cbs ccb ccc cce cci ccm ccr ccs ce- ceb cec cee cei cem cer ces ci- cib cic cie cii cim cir cis cmb cmc cme cmi cmm cmr cms crb crc cre cri crm crr crs csb csc cse csi csm csr css ebb ebc ebe ebi ebm ebr ebs ec- ecb ecc ece eci ecm ecr ecs eeb eec eee eem eer ees eib eic eie eii eim eir eis em- emb emc eme emi emm emr ems erb erc ere eri erm err ers es- esb esc ese esi esm esr ess ibb ibc ibe ibi ibm ibr ibs icb icc ice ici icm icr ics ie- iec iee iei iem ier ies iib iic iie iii iim iir iis im- imb imc ime imi imm ims ir- irb irc ire iri irm irr irs is- isb isc ise isi ism isr iss m-r mbb mbc mbe mbi mbm mbr mbs mc- mcb mcc mce mci mcm mcr mcs meb mec mee mei mem mer mes mi- mib mic mie mii mim mir mis mmb mmc mme mmi mmm mmr mms mrb mrc mre mri mrm mrr mrs msb msc mse msi msm msr mss rbb rbc rbe rbi rbm rbr rbs rcb rcc rce rci rcm rcr rcs re- reb rec ree rei rem rer res rib ric rie rii rim rir ris rmb rmc rme rmi rmm rmr rms rrb rrc rri rrm rrr rrs rsb rsc rse rsi rsm rsr rss sbb sbc sbe sbi sbm sbr sbs scb scc sce sci scm scr scs se- seb sec see sei sem ser ses sib sic sie sii sim sir sis smb smc sme smi smm smr sms sr- srb src sre sri srm srr srs ss- ssb ssc sse ssi ssm ssr sss