71The principle of equality of arms, which is a corollary of the very concept of a fair hearing (Joined Cases C-514/07 P, C-528/07 P and C-532/07 P Sweden and Others v API and Commission [2010] ECR I-8533, paragraph 88), implies that each party must be afforded a reasonable opportunity to present his case, including his evidence, under conditions that do not place him at a substantial disadvantage vis-à-vis his opponent.
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