16It should be noted 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 a reply to its questions concerning the interpretation or validity of certain provisions of EU law to be necessary to enable it to give judgment (see judgments of 4 May 2016, Pillbox 38, C‑477/14, EU:C:2016:324, paragraph 24, and Philip Morris Brands and Others, C‑547/14, EU:C:2016:325, paragraph 47 and the case-law cited).
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