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based on an earlier version of the Wolfram Language.
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Verbatim

Verbatim[expr]
represents expr in pattern matching, requiring that expr be matched exactly as it appears, with no substitutions for blanks or other transformations.
  • Verbatim[x_] will match only the actual expression x_.
  • Verbatim is useful in setting up rules for transforming other transformation rules.
  • Verbatim[expr] does not maintain expr in an unevaluated form.
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