       │ struct Rectangle {
       │     width: u32,
       │     height: u32,
       │ }
       │ 
       │ fn main() {
       │     let rect1 = Rectangle { width: 30, height: 50 };
       │ 
       │     println!(
       │         "The perimeter of the rectangle is {} pixels.",
       │         perimeter(&rect1)
       │     );
       │ }
       │ 
       │ fn area(rectangle: &Rectangle) -> u32 {
       │     rectangle.width * rectangle.height
       │ }
       │ 
       │ fn perimeter(rectangle: &Rectangle) -> u32 {
       │     (rectangle.width + rectangle.height) * 2
       │ }
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