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Posts about semantic pattern matching rather than syntactic pattern matching (which is the built-in pattern matcher of Mathematica) e.g. "Why x^3 /. x^2->a doesn't work!"
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Questions about Mathematica programs and the Wolfram Language in combination with the content management system WordPress.
Questions on the use of spacing, signs, and typographical elements for the composition, parsing, and interpretation of expressions in Mathematica.