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This is a [cross post]( from
David, thank you so much :).
This was cross posted to
Nick James, I am also quite interested in this. Sadly I now know practically nobody even going to high school. Oh well, good luck!
I always use `Unevaluated[Sequence[]]` inside If as my "vanishing function". So techinically I just use Sequence[]. That seems straightforward :). But this is nothing new I see, it can be found by following some more links in the linked article...