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  • Your title does not seem to represent your question. "How to interactively select alist cons pair's cdr instead of whole cons" seems to be a problem that you have successfully solved already by using alist-get instead of assq. Your actual question seems to be about mapping from the value of one alist entry to the value of another entry of the same alist. Can you please clarify the title/question to make them consistent? Commented Feb 23, 2018 at 4:38
  • Sorry about this, I did considered the question title, but don't know how to describe it. I will update the title now. Commented Feb 23, 2018 at 6:47