c-- ccc ccf ccm cco ccu cfc cff cfm cfo cfu cmc cmf cmm cmo cmu co- coc cof com coo cou cuc cuf cum cuo cuu fcc fcf fcm fco fcu ffc fff ffm ffo ffu fmc fmf fmm fmo fmu foc fof fom foo fou fuf fum fuo fuu m-f m-o mc- mcc mcf mcm mco mcu mfc mff mfm mfo mfu mmc mmf mmm mmo mmu moc mof mom moo mou muc muf mum muu oc- occ ocf ocm oco ocu of- ofc off ofm ofo ofu om- omc omf omm omo omu oo- ooc oof oom ooo ou- ouc ouf oum ouo ucc ucf ucm uco ucu ufc uff ufm ufo ufu um- umc umf umm umo umu uoc uom uoo uuc uum uuu