- 15 - V PRELIMINARY CONSIDERATION ON THE PARTICIPATION OF J.R. A. Arguments of the parties and of the Commission Cf. Case of Rodríguez Vera et al. (Disappeared from the Palace of Justice) v. Colombia, supra, para. 27, and Case of Gonzales Lluy et al. v. Ecuador. Preliminary objections, merits, reparations and costs. Judgment of September 1, 2015. Series C No. 298, para. 49. 20