72Regarding Clause 4 of the framework agreement, it should be borne in mind that, according to settled case-law, as the principle of non-discrimination has been put into effect and specifically applied by the framework agreement solely as regards differences in treatment as between fixed-term workers and permanent workers in a comparable situation, any differences in treatment between specific categories of fixed-term staff are not covered by the principle of non-discrimination established by that framework agreement (see, to that effect, judgment of 21 November 2018, Viejobueno Ibáñez and de la Vara González, C‑245/17, EU:C:2018:934, paragraph 51 and the case-law cited).
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