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Should both the articles be used here? Or one? Or none?
1) You are using an invalid or an expired link.
2) I need a small or a medium-size box, not large.
3) Please take a green or a blue piece of paper.
4) There are 3 pencils of 3 colors. Please take the red or the blue one.
The first article is needed; the second is not wrong, but not needed either. Unless it adds clarity (not the case for any of your examples here), it's better to omit it.
