98Furthermore, Article 21 of the Charter, serving as the basis of the plea relating to the prohibition of discrimination on grounds of nationality or ethnic origin, is a particular expression of the principle of equal treatment (see, to that effect, judgment of 29 April 2015, Léger, C‑528/13, EU:C:2015:288, paragraph 48) and both that principle and the prohibition of any discrimination are simply two labels for a single general principle of law, which prohibits both treating similar situations differently and treating different situations in the same way unless there are objective reasons for such treatment (judgment of 27 January 2005, Europe Chemi-Con (Deutschland) v Council, C‑422/02 P, EU:C:2005:56, paragraph 33).
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