46Having regard to the general principle of equality of arms, which presupposes that in a competition case the knowledge which the undertaking concerned has of the file used in the proceeding is the same as that of the Commission, the Commission is not entitled to decide on its own whether the documents seized in the investigation of the matter are capable of exonerating the undertaking concerned. At the least, therefore, the Commission must draw up a sufficiently detailed list of the documents which are not annexed to the statement of objections to enable the undertaking to which that statement is addressed to request access to specific documents likely to be useful in its defence (Solvay, paragraphs 83 and 101).