74First, the documents in a file relating to the pre-litigation stage of infringement proceedings constitute, as regards protection of the purpose of investigations, a single category of documents, and no distinction should be made on the basis of the type of document forming part of the file or of the author of the documents in question (see, to that effect, judgment in LPN and Finland v Commission, C‑514/11 P and C‑605/11 P, EU:C:2013:738, paragraph 64).
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