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This question already has an answer here:

When to use the former and when to use the later? And why?

Example:

You never eat the bell peppers of your lunch boxes.

You never eat the bell peppers in your lunch boxes.

marked as duplicate by Teacher KSHuang, M.A.R. ಠ_ಠ, Glorfindel, Chenmunka, WRX May 16 '17 at 13:34

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  • Why do you think both are OK? When would you use one or the other? – Teacher KSHuang May 16 '17 at 7:56
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The outside of the lunch box is pink.

The food wraps in the lunch box are vegetarian.

  • I think that's a lunch box bag? – alex May 16 '17 at 10:25
  • Both would be considered to be lunch boxes, even though the Hello Kitty lunch box has a cloth exterior, it has sold sides. – Peter May 16 '17 at 10:44

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