-er bbb bbe bbi bbm bbr bbs be- beb bee bei bem ber bes bi- bib bie bii bim bir bis bmb bme bmi bmm bmr bms brb bre bri brm brr brs bsb bse bsi bsm bsr bss ebb ebe ebi ebm ebr ebs eeb eee eem eer ees eib eie eii eim eir eis em- emb eme emi emm emr ems erb ere eri erm err ers es- esb ese esi esm esr ess ibb ibe ibi ibm ibr ibs ie- iee iei iem ier ies iib iie iii iim iir iis im- imb ime imi imm ims ir- irb ire iri irm irr irs is- isb ise isi ism isr iss m-r mbb mbe mbi mbm mbr mbs meb mee mei mem mer mes mi- mib mie mii mim mir mis mmb mme mmi mmm mmr mms mrb mre mri mrm mrr mrs msb mse msi msm msr mss rbb rbe rbi rbm rbr rbs re- reb ree rei rem rer res rib rie rii rim rir ris rmb rme rmi rmm rmr rms rrb rri rrm rrr rrs rsb rse rsi rsm rsr rss sbb sbe sbi sbm sbr sbs se- seb see sei sem ser ses sib sie sii sim sir sis smb sme smi smm smr sms sr- srb sre sri srm srr srs ss- ssb sse ssi ssm ssr sss