bbb bbe bbi bbm bbs be- beb bee bei bem bes bi- bib bie bii bim bis bmb bme bmi bmm bms bsb bse bsi bsm bss ebb ebe ebi ebm ebs eeb eee eem ees eib eie eii eim eis em- emb eme emi emm ems es- esb ese esi esm ess ibb ibe ibi ibm ibs ie- iee iei iem ies iib iie iii iim iis im- imb ime imi imm ims is- isb ise isi ism iss mbb mbe mbi mbm mbs meb mee mei mem mes mi- mib mie mii mim mis mmb mme mmi mmm mms msb mse msi msm mss sbb sbe sbi sbm sbs se- seb see sei sem ses sib sie sii sim sis smb sme smi smm sms ss- ssb sse ssi ssm sss