20In that regard, it should be borne in mind that it follows from the spirit of cooperation which must prevail in the operation of the preliminary reference procedure that it is essential that the national court sets out in its order for reference the precise reasons why it considers that a reply to its questions concerning the interpretation of certain provisions of EU law is necessary to enable it to give judgment (see, to that effect, judgment of 4 May 2016, Philip Morris Brands and Others, C‑547/14, EU:C:2016:325, paragraph 47 and the case-law cited).
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