Four Integers

There exists two distinct positive integers $$x_1,x_2$$ such that $\sqrt{n-x_1}$ $\sqrt{n-x_2}$ $\sqrt{n+x_1}$ $\sqrt{n+x_2}$ are $$4$$ distinct positive integers, for some positive integral value of $$n$$. What is the smallest possible value of $$n$$?

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