c-- ccc ccf ccm cco ccv cfc cff cfm cfo cfv cmc cmf cmm cmo cmv co- coc cof com coo cov cvc cvf cvm cvo cvv fcc fcf fcm fco fcv ffc fff ffm ffo ffv fmc fmf fmm fmo fmv foc fof fom foo fvc m-f m-o m-v mc- mcc mcf mcm mco mcv mfc mff mfm mfo mfv mmc mmf mmm mmo mmv moc mof mom moo mov mvc mvf mvm mvo mvv oc- occ ocf ocm oco ocv of- ofc off ofm ofo ofv om- omc omf omm omo omv oo- ooc oof oom ooo oov ov- ovc ovf ovo ovv vcc vcf vcm vco vfc vff vfm vfv vm- vmc vmf vmm vmo voc vof vom voo vov vvc vvm vvo vvv