35The Court has concluded from all the above considerations that the functioning of the system of cooperation between the Court of Justice and the national courts established by Article 267 TFEU requires, as does the principle of primacy of EU law, the national court to be free to refer to the Court for a preliminary ruling any question that it considers necessary, at whatever stage of the proceedings it considers appropriate, even at the end of an interlocutory procedure for the review of constitutionality (judgment in A, C‑112/13, EU:C:2014:2195, paragraph 39).
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