-ic bbb bbc bbe bbi bbm bbo bcb bcc bce bci bcm bco be- beb bec bee bei bem beo bi- bib bic bie bii bim bio bmb bmc bme bmi bmm bmo bob boc boe boi bom boo c-- cbb cbc cbe cbi cbm cbo ccb ccc cce cci ccm cco ce- ceb cec cee cei cem ceo ci- cib cic cie cii cim cio cmb cmc cme cmi cmm cmo co- cob coc coe coi com coo ebb ebc ebe ebi ebm ebo ec- ecb ecc ece eci ecm eco eeb eec eee eem eeo eib eic eie eii eim eio em- emb emc eme emi emm emo eo- eob eoc eoe eoi eom eoo ibb ibc ibe ibi ibm ibo icb icc ice ici icm ico ie- iec iee iei iem iib iic iie iii iim iio im- imb imc ime imi imm imo io- iob ioc ioe ioi iom ioo m-o mbb mbc mbe mbi mbm mbo mc- mcb mcc mce mci mcm mco meb mec mee mei mem meo mi- mib mic mie mii mim mio mmb mmc mme mmi mmm mmo mob moc moe moi mom moo o-i ob- obb obc obe obi obm obo oc- ocb occ oci ocm oco oeb oec oee oei oem oeo oib oic oie oii oim oio om- omb omc ome omi omm omo oo- oob ooc ooi oom ooo