55The principle of equal treatment must be reconciled with the principle of legality (see, to that effect, judgment in The Rank Group, C‑259/10 and C‑260/10, EU:C:2011:719, paragraph 62 and the case-law cited). Therefore, given that, in the assessment of the first ground of appeal, the finding as to the duration of the appellant’s participation in the cartel was held to be correct, the possibly unjustified favourable treatment limited to Repsol cannot bring about a reduction in the length of that participation.
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