Here, (d) represents the distance Masha travels through the Siberian wilderness, from ((x_1, y_1)) to ((x_2, y_2)), a path that may lead her to uncover the secrets behind "MSH 45" and "LQ 69".
Here, (d) represents the distance Masha travels through the Siberian wilderness, from ((x_1, y_1)) to ((x_2, y_2)), a path that may lead her to uncover the secrets behind "MSH 45" and "LQ 69".