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Every opportunity to relate one part of the puzzle to another part of the puzzle is taken; no part of the puzzle is wasted. When designed well, this kind of puzzle means endless surprise, solving it means delving deeper and deeper; you become faimilar with every letter, every picture, every clue. It’s not just that it could be important—eventually it will be important. And by the time you’re finished, you know the puzzle better than you thought you ever could, and you rarely forget any part of it.
