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Refreshing point. That is why old text books would evaluate the items on either side of the divide ahead of the divide - i'll be they were protecting the principle. I think I recall so, but it has been many decades but I think the principles were introduced just ahead of these kinds of examples. One of the videos on this says this was an out of vogue view. You make a great point
that it cannot be out of vogue, its essential.

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