c-- ccc cce ccf ccm cco ccz ce- cec cee cef cem ceo cez cfc cfe cff cfm cfo cfz cmc cme cmf cmm cmo co- coc coe cof com coo coz cz- czc cze czm czo ec- ecc ece ecf ecm eco eec eee eef eem eeo ef- efc efe eff efm efo em- emc eme emf emm emo eo- eoc eoe eof eom eoo eze ezf ezo ezz fcc fce fcf fcm fco fcz fec fee fef fem feo fez ffc ffe fff ffm ffo ffz fmc fme fmf fmm fmo foc foe fof fom foo foz m-f m-o mc- mcc mce mcf mcm mco mcz mec mee mef mem meo mez mfc mfe mff mfm mfo mfz mmc mme mmf mmm mmo mmz moc moe mof mom moo moz mzf mzm oc- occ ocf ocm oco ocz oec oee oef oem oeo of- ofc ofe off ofm ofo ofz om- omc ome omf omm omo omz oo- ooc oof oom ooo oze ozm ozo ozz zce zco zec zee zef zem zeo zez zfc zmc zmm zo- zoc zoe zof zom zoo zzz