@YeslinS You can always just use your own imagination about what to expect. In fact, early investigators didn't have the advantages you have available today and had to use their imaginations, come up with ideas, use them to deduce to specific test circumstances, run the tests, see if it was predictive, or not. Develop those skills -- no one can stuff your mind here, you exercise it yourself or not at all. Being spoon fed won't help develop your imagination. What can you say about the very surfaces that's not like the interior or a 1D case? What suddenly changes there?
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