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Consider the following system of coupled differential equations:$$\begin{cases}\dfrac{dx}{dt} = \frac{x - y}{2} \\ \dfrac{dy}{dt} = \frac{x + y}{2}\end{cases}$$Sketch the phase portrait for the system by drawing the velocity vector at each grid point \((x, y)\) where \(x, y \in \{-2, -1, 0, 1, 2\}\).

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