453That line of argument must be rejected, since the applicants cannot claim that the Commission wrongly relied on the case-law relating to complex infringements (see paragraphs 418 and 419 above) in the present case. The fact that the infringement in the present case involved only two undertakings, one of which was a small undertaking, and that it lasted only 8 months and 12 days does not change the fact that the Commission is not required to categorise either as an agreement or as a concerted practice each form of conduct found, but may characterise some of those forms of conduct as ‘agreements’ and others as ‘concerted practices’. In that respect, and since the Commission established to the requisite legal standard the occurrence of contacts between the parties, the Commission cannot be required, as the applicants suggest, to determine exactly each individual occasion that the parties concerted.
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