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Getting ready

To explain abstraction, we will use abstract classes. Imagine that you are dealing with trainee space astronauts who need to progress through the ranks as they get trained. The truth is that once you as trainee learn a new skill, that skill is learned and will remain with you even though you learn more advanced ways to do things. You must also implement all the previous skills learned in the new object you create. Abstract classes demonstrate this concept very nicely.

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