45In particular, in the light of the spirit of cooperation which must prevail in the operation of the preliminary reference procedure and in accordance with Article 94(c) of those rules, it is essential that the national court set out in its order for reference the precise reasons which led it to question the validity of certain provisions of EU law and the grounds of invalidity which appear to it capable of being upheld (see, to that effect, judgments of 10 January 2006, IATA and ELFAA, C‑344/04, EU:C:2006:10, paragraph 31, and of 4 May 2016, Pillbox 38, C‑477/14, EU:C:2016:324, paragraphs 24 and 25 and the case-law cited).
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