bbb bbc bbg bbm bbo bcb bcc bcg bcm bco bgb bgc bgg bgm bgo bmb bmc bmg bmm bmo bob boc bog bom boo c-- cbb cbc cbg cbm cbo ccb ccc ccg ccm cco cgb cgc cgg cgm cgo cmb cmc cmg cmm cmo co- cob coc cog com coo gbc gbg gbm gbo gcb gcc gcg gcm gco ggb ggc ggg ggm ggo gmb gmc gmg gmm gmo gob goc gog gom goo m-o mbb mbc mbg mbm mbo mc- mcb mcc mcg mcm mco mgb mgc mgm mgo mmb mmc mmg mmm mmo mob moc mog mom moo ob- obb obc obg obm obo oc- ocb occ ocg ocm oco ogc ogg ogo om- omb omc omg omm omo oo- oob ooc oog oom ooo