47As the principle of equal treatment is a concept of EU law (judgment of 6 October 2011, Graf and Engel, C‑506/10, EU:C:2011:643, paragraph 26), in order to ascertain whether there may be an instance of unequal treatment in the context of the Agreement on free movement of persons, it is necessary, as is apparent from paragraphs 36 above, to refer, by analogy, to the principles established by the Court’s case-law cited in paragraph 46 above.
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