While you can't control when a package will be delivered, you can set buyers' expectations by letting them know when an item will be shipped and making every effort to ship packages within your specified time frame. Shipping promptly and managing buyers' expectations can help you avoid:
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Given a layer of abstraction and an interface, any object satisfying the interface can be used to complete the task. It is one of the building blocks of object oriented programming. e.g. Since a Magic carpet satisfies our interface for a vehicle, it can be used for transportation if it existed. A queue built using a Heap (data structure) would be the same as one built on arrays if the interface is followed.