42In that regard, whether the requirement that situations must be comparable for the purpose of determining whether there is a breach of the principle of equal treatment has been met must be assessed in the light of all the elements which characterise them and, in particular, in the light of the subject matter and purpose of the national legislation which makes the distinction at issue (see, to that effect, judgments of 16 July 2015, CHEZ Razpredelenie Bulgaria, C‑83/14, EU:C:2015:480, paragraph 89, and of 26 June 2018, MB (Change of gender and retirement pension), C‑451/16, EU:C:2018:492, paragraph 42).
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