c-- ccc ccf ccg ccm cco ccx cfc cff cfg cfm cfo cfx cgc cgg cgm cgo cmc cmf cmg cmm cmo cmx co- coc cof cog com coo cox cxc cxf cxo cxx fcc fcf fcg fcm fco fcx ffc fff ffg ffm ffo ffx fgc fgf fgg fgm fmc fmf fmg fmm fmo fmx foc fof fog fom foo fox fxg fxm fxx gcc gcf gcg gcm gco gfc gff gfm gfo gfx ggc ggg ggm ggo gmc gmf gmg gmm gmo gmx goc gof gog gom goo gox gxf m-f m-o mc- mcc mcf mcg mcm mco mcx mfc mff mfg mfm mfo mgc mgf mgm mgo mgx mmc mmf mmg mmm mmo mmx moc mof mog mom moo mox mxc oc- occ ocf ocg ocm oco ocx of- ofc off ofg ofm ofo ofx ogc ogf ogg ogo ogx om- omc omf omg omm omo omx oo- ooc oof oog oom ooo oox ox- oxc oxf oxo oxx xcf xcx xfm xfx xmc xmf xmg xmm xmo xmx xoc xof xog xom xoo xox xxo xxx