Even if X contains Y, there is no need to call Y X.
A "Hey, human!"
B "What a creature."
You're sorting things out and you think, "Hey, doesn't this list Y all go on list X?" Sometimes I think, "Hey, doesn't this list Y all go on list X?
Talking about whether to move the contents A,B,C of list Y to X at this time.
For a moment you think that is a good thing, but then you take it to the extreme and it becomes "Mr. Tanaka is an organism, and Yakult bacteria are also organisms", futile!
A "set that encompasses many things" is also "a low-resolution way of cognition." see Cognitive Resolution. Not too happy with book tags on all books.
Physical objects only fit in one box, so you have to think, "Which box should I put it in?"
But electronic information can be put in both.
The key question is, "Are all the elements of Y elements of X?"
If that's really the case, then there's no need for a human to do the work of putting in both X and Y.
When you're in Y, you're supposed to be in X.
If you want to get to A when you see X, all you need is a path (link) from X to Y
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