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Questions about Mathematica's rule-based replacement functionality, including functions such as Rule (->), RuleDelayed (:>), Replace, ReplaceAll (/.) and ReplaceRepeated (//.).

Questions specifically dealing with the pattern matching capabilities of Mathematica (i.e. what the left hand side of a replacement rule will match) should use the tag . Questions about how to perform structural manipulation on or with held (unevaluated) expressions should use the tag .

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