The importance of distinguishing between restrictive and non-restrictive elements when punctuating sentences.
Restrictive and non-restrictive elements provide additional information about a noun, with restrictive elements being essential and not requiring commas, while non-restrictive elements are non-essential and need commas.
For example, in the sentence 'An expert in organ transplants, the chief surgeon of the hospital routinely spoke at conferences,' 'an expert in organ transplants' is a non-restrictive element as it can be removed without changing the core meaning.
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