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Use "falsum" in a sentence
"Falsum in uno, falsum in toto, as right wingers like to say."
"Aristotle, Vulgus dividi in oppositum contra sapientes, quod vulgo videtur verum, falsum est; that which the commonalty accounts true, is most part false, they are still opposite to wise men, but all the world is of this humour"
"Credat qui vult gemmas mirabilia efficere; mihi qui et ratione et experientia didici aliter rem habere, nullus facile persuadebit falsum esse verum."