Let the image of the point \( P(0,-5,0) \) in the line \( \dfrac{x-1}{2}=\dfrac{y}{1}=\dfrac{z+1}{-2} \) be the point \( R \) and the image of the point \( Q\!\left(0,\dfrac{-1}{2},0\right) \) in the line \( \dfrac{x-1}{-1}=\dfrac{y+9}{4}=\dfrac{z+1}{1} \) be the point \( S \). Then the square of the area of the parallelogram \( PQRS \) is ________.
