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Creating the animator and the gravity behaviour to animate our square
lazy var animator: UIDynamicAnimator = {
return UIDynamicAnimator(referenceView: self.animationView)
lazy var gravity:UIGravityBehavior = {
let lazyGravity = UIGravityBehavior()
return lazyGravity
func animateSquare(){
// 1. Add behaviors to the animator
// 2. Add items to the behavior
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