A tangent line L is drawn at the point $(2,-4)$ on the parabola $\mathrm{y}^2=8 \mathrm{x}$. If the line L is also tangent to the circle $\mathrm{x}^2+\mathrm{y}^2=\mathrm{a}$, then ' a ' is equal to $\_\_\_\_$ .
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