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Ryan Budney
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Yes, of course there is. It's sort of tautological. There's countably-many isotopy classes of knots. So index them by the natural numbers. Let $L$ be the first knot in the indexing. Your operation (you only need one) is the operation that sends the $n$-th knot in the list to the $(n+1)$-th.

Ryan Budney
  • 44.4k
  • 2
  • 139
  • 245