bbb bbe bbi bbm bbo be- beb bee bei bem beo bi- bib bie bii bim bio bmb bme bmi bmm bmo bob boe boi bom boo ebb ebe ebi ebm ebo eeb eee eem eeo eib eie eii eim eio em- emb eme emi emm emo eo- eob eoe eoi eom eoo ibb ibe ibi ibm ibo ie- iee iei iem iib iie iii iim iio im- imb ime imi imm imo io- iob ioe ioi iom ioo m-o mbb mbe mbi mbm mbo meb mee mei mem meo mi- mib mie mii mim mio mmb mme mmi mmm mmo mob moe moi mom moo o-i ob- obb obe obi obm obo oeb oee oei oem oeo oib oie oii oim oio om- omb ome omi omm omo oo- oob ooi oom ooo