While eating cheese sticks at lunch...
Luke: I turned my two cheese sticks into four!
Me: Cool! You had two and you divided them in halves to get four.
Luke: Yes. Now I subtracted two of them because I ate them.
Me: So you have two left?
Luke: Yes! And soon, I'm going to subtract these two and then, I'll have zero. Maybe you should get another cheese stick to add to my plate.
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