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The key to finding a letterbox. A clue can be created in many different formats: in rhyme, as a riddle, as a story, with pictures or cartoons, or as directions with paces or compass headings. The only limit is your imagination! You can find clues to most U.S. letterboxes listed on the Letterboxing North America web site, though you may occasionally find them elsewhere. See cuckoo clue.








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