52As regards, in the first place, Clause 4(1) of the framework agreement, it should be recalled that, since the principle of non-discrimination has been implemented 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 the framework agreement (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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