i need an example of an oop code which includes 4 concepts

I am suppose to write a simple code that covers top 4 concepts of OOP (Object Oriented Programming) e.g.: Abstraction.
I have tried a few but they only carried one concept. Can anyone help me out.
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What do you think these top four concepts are?

And how about showing use your best attempt, or two. (You say you've tried a few?)

Andy
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