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> I have a that/which question. I've had reputable sources tell
> me that there are distinct rules for using "that" and
> "which"....namely, that one is restrictive and the other is not....
Yes, that's the way I've always heard it.
> Does anyone else out there follow this rule? It seems pretty
> subtle to me. (If it changed the meaning of a sentence, I might worry about
> it...
I do follow it. Whether other things fit the "demonstrative clause" (or is it
a "relative clause"?...) can be useful information.