Two tangent lines \( l_{1} \) and \( l_{2} \) are drawn from the po...

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Two tangent lines \( l_{1} \) and \( l_{2} \) are drawn from the point
\( \mathrm{P} \) \( (2,0) \) to the parabola \( 2 y^{2}=-x \). If the lines \( l_{1} \) and \( l_{2} \)

W are also tangent to the circle \( (x-5)^{2}+y^{2}=r \), then \( 17 r \) is equal to
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