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Grammarly recommends removing the second comma but for me it seems that this is needed. What would be the correct comma use in such a sentence?

Two variables, fracture type and management method, were examined in separate models since certain fractures are treated with specific operation methods.

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  • Grammarly won't know if you're writing a list or using a noun phrase in apposition. Do what you think is correct, not what it tells you.
    – Stuart F
    Commented Jun 21, 2021 at 13:51
  • You need the commas because this is a nonrestrictive appositive. Commented Jun 21, 2021 at 15:29
  • @GArthurBrown Wouldn't you say there's a restrictive appositive in 'Two of the children, John and Anne, are still at nursery'? Commented Jun 21, 2021 at 15:42
  • @EdwinAshworth Sure. What's the got to do with the price of tea? Commented Jun 21, 2021 at 15:46
  • @GArthurBrown Your English Grammar reference states baldly 'A restrictive appositive ... is not separated from the rest of the sentence by commas.' Commented Jun 21, 2021 at 16:13

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