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Use the model universe method to show that the following argument is invalid. (3x) (Fx Gx), (x) (Gx = Hx) /.. (x) (Ax = ~Fx)

Use the model universe method to show that the following argument is invalid.

(3x) (Fx Gx), (x) (Gx = Hx) /.. (x) (Ax = ~Fx)

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