-ic bbb bbc bbi bbm bbo bcb bcc bci bcm bco bi- bib bic bii bim bio bmb bmc bmi bmm bmo bob boc boi bom boo c-- cbb cbc cbi cbm cbo ccb ccc cci ccm cco ci- cib cic cii cim cio cmb cmc cmi cmm cmo co- cob coc coi com coo ibb ibc ibi ibm ibo icb icc ici icm ico iib iic iii iim iio im- imb imc imi imm imo io- iob ioc ioi iom ioo m-o mbb mbc mbi mbm mbo mc- mcb mcc mci mcm mco mi- mib mic mii mim mio mmb mmc mmi mmm mmo mob moc moi mom moo o-i ob- obb obc obi obm obo oc- ocb occ oci ocm oco oib oic oii oim oio om- omb omc omi omm omo oo- oob ooc ooi oom ooo