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* code which is executed but has no external effect (e.g., does not change the output produced by a program; known as [[dead code]]).
A [[NOP (code)|NOP]] instruction might be considered to be redundant code that has been explicitly inserted to pad out the [[instruction (computer science)|instruction]] stream or introduce a time delay, for example to create a timing loop by "wasting time". [[Identifier]]s that are declared, but never referenced, are termed '''redundant declarations'''.
==Examples==
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