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6. Find a counterexample, if possible, to these universally quantified statements, where the domain for all variables consists of all real numbers. Otherwise, state that

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6. Find a counterexample, if possible, to these universally quantified statements, where the domain for all variables consists of all real numbers. Otherwise, state that no counterexample exists. (5 points each) (a) xy(y=xyx1xy) (b) xyz(x=yz) (c) xy((yx)(x17>y)(y

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