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I understand that a pair of a locking device and an opening device is asymmetric, and a single device which can both lock and open is symmetric.

Is that correct?

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  • I’m voting to close this question because you reposted a closed question
    – schroeder
    May 12 at 15:24
  • Questions are being closed for a reason. If you just repost the same question, not only will it be closed for the same reason, it also irritates everyone involved.
    – MechMK1
    May 12 at 15:39
  • @MechMK1 I didn't exactly repost. Per comment there I thought that it's okay to try to ask another similar question. I get the idea.
    – opener
    May 12 at 17:19
  • This question is identical.
    – schroeder
    May 12 at 18:42
  • @opener I see absolutely no semantic difference between this question and the previous question. Just because you worded it differently doesn't mean the question itself is any different? "How long is a string?" and "What is the length of a string?" are identical questions.
    – MechMK1
    May 12 at 20:06

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