JiangZijian

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**Following paragraph is taken from [https://reference.wolfram.com/language/tutorial/EvaluationOfExpressions.html.en?source=footer](https://reference.wolfram.com/language/tutorial/EvaluationOfExpressions.html.en?source=footer)** > Attributes like Flat can affect not only evaluation, but also operations such as pattern matching. If you give definitions or transformation rules for...