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2. National Geographic Video - Wikipedia

   en.wikipedia.org/wiki/National_Geographic_Video

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3. Cryptography - Wikipedia

   en.wikipedia.org/wiki/Cryptography

   However, in cryptography, code has a more specific meaning: the replacement of a unit of plaintext (i.e., a meaningful word or phrase) with a code word (for example, "wallaby" replaces "attack at dawn"). A cypher, in contrast, is a scheme for changing or substituting an element below such a level (a letter, a syllable, or a pair of letters, etc ...