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What is the minimum value of $\left| \frac{(x^{2} + x + 1)(y^{2} + y + 1)(z^{2} + z + 1)(t^{2} + t + 1)}{xyzt} \right|$ as $x,y,z,t$ range over all non-zero real numbers?

This problem is posed by Samuel Q.

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