66However, any differences in treatment between specific categories of fixed-term workers, such as that reported by the referring court, which is not based on the fixed-term or permanent nature of the employment relationship, but on whether it is statutory or contractual, is not covered by the principle of non-discrimination established by the framework agreement (see, to that effect, orders of 11 November 2010, Vino, C‑20/10, not published, EU:C:2010:677, paragraph 57, and of 7 March 2013, Rivas Montes, C‑178/12, not published, EU:C:2013:150, paragraphs 44 and 45).
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