-ic bbb bbc bbi bbm bbo bbx bcb bcc bci bcm bco bcx bi- bib bic bii bim bio bix bmb bmc bmi bmm bmo bmx bob boc boi bom boo box bxb bxi bxm bxo bxx c-- cbb cbc cbi cbm cbo cbx ccb ccc cci ccm cco ccx ci- cib cic cii cim cio cix cmb cmc cmi cmm cmo cmx co- cob coc coi com coo cox cxc cxi cxo cxx ibb ibc ibi ibm ibo ibx icb icc ici icm ico iib iic iii iim iio iix im- imb imc imi imm imo imx io- iob ioc ioi iom ioo ixc ixi m-o mbb mbc mbi mbm mbo mbx mc- mcb mcc mci mcm mco mcx mi- mib mic mii mim mio mix mmb mmc mmi mmm mmo mmx mob moc moi mom moo mox mxc mxi o-i ob- obb obc obi obm obo obx oc- ocb occ oci ocm oco ocx oib oic oii oim oio om- omb omc omi omm omo omx oo- oob ooc ooi oom ooo oox ox- oxb oxc oxi oxo oxx xbc xbx xcb xci xcx xic xii xio xix xmc xmi xmm xmo xmx xoc xoi xom xoo xox xxi xxo xxx