85In that regard, it must be pointed out that, even if it is ultimately for the national court, which has sole jurisdiction to assess the facts and interpret the national legislation, to determine whether and to what extent such collective action meets those requirements, the Court of Justice, which is called on to provide answers of use to the national court, may provide guidance, based on the file in the main proceedings and on the written and oral observations which have been submitted to it, in order to enable the national court to give judgment in the particular case before it.
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