All potential causes of lung cancer are homes contaminated by radon gas. No completely successful procedures are sex-change operations. Some works that celebrate the revolutionary spirit are murals by Diego Rivera. Some substances with a crystalline structure are not forms of carbon. No radically egalitarian societies are societies that preserve individual liberties.
All cult leaders are people who brainwash their followers.
Some college football coaches are not persons who slip money to their players. Some budgetary cutbacks are actions unfair to the poor. All physicians eligible to practice are physicians whose licenses are intact. No compressible substances are non-gasses. Some scientists who believe in a final particle theory are scientists who do not back the supercollider.