56With regard to the requirement relating to the comparability of the situations for the purpose of determining whether there is an infringement of the principle of equal treatment, that requirement must be assessed in the light of all the factors characterising those situations (see, inter alia, judgments of 16 December 2008, Arcelor Atlantique et Lorraine and Others, C‑127/07, EU:C:2008:728, paragraph 25, and of 1 October 2015, O, C‑432/14, EU:C:2015:643, paragraph 31).
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