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"It is certain you have a nose when you can smell but not everyone with a nose can smell".

Or "It is certain you have a brain when you can think. But not everyone with a brain can think"

Note: As I said earlier on, these statements are just hypothetical. I just want you to understand what I'm trying to convey.

(EDIT) Please if you know any term related to it, feel free to say it.

  • I'm not sure to understand... It seems to me that you are expressing a condition that is necessary but not sufficient, because : "if you can smell, then you have a nose" is true but "if you have a nose, then you can smell" is not. Thus, having a nose is necessary but not sufficient to be able to smell. – Mauro ALLEGRANZA Mar 17 at 10:37
  • Thank you very much!! I just read the Wikipedia article and what you said is exactly what I wanted! — "necessary but not sufficient". – W. Bruce Mar 17 at 12:24

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