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Use rules of inference to show that If x (P(x) Q(x)), x (Q(x) S(x)), x (R(x) S(x)), and xP(x) are true, then x R(x) is

Use rules of inference to show that If x (P(x) Q(x)), x (Q(x) S(x)), x (R(x) S(x)), and xP(x) are true, then x R(x) is true.

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