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Now, when *you* are writing about the energy change in region A, you may
decide that you are not interested in what's going on in the adjacent
region B. That's fine. You are free to say nothing about region B, so
long as you don't say wrong things about it. Your description of the
universe may be incomplete, but it is not wrong.
However, suppose *I* am doing the writing. Suppose I choose to give a
more-complete description, mentioning the whole flow, not just one end of
the flow.