<image>As shown in the figure, point \( A \) is on the hyperbola \( y = \dfrac{2}{x} \), point \( B \) is on the hyperbola \( y = \dfrac{5}{x} \), and \( AB \parallel y \)-axis. Points \( C \) and \( D \) are on the \( y \)-axis. If the quadrilateral \( ABCD \) is a parallelogram, then its area is ______. 