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Puzzle 25: Twincognito 2

Twincognito is interesting; since a single white cell on one side of the grid can easily cause another cell on the other side to become black, the logical possibilities are different from most puzzles. However, it can therefore require especially keen observation on the part of the solver, making the puzzle quite sadistic, especially at gigantic sizes (such as this specimen). Of course, even sadism can be somehow fun and appealing. I believe this 17x17 puzzle is an example of that. :)
Rules of Twincognito

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