27It follows that it is not necessary for such a course of conduct to be established in specific countries or, in particular, in all the Contracting States. The fact that a practice is generally and regularly observed by operators in the countries which play a prominent role in the branch of international trade or commerce in question can be evidence which helps to prove that a usage exists. The determining factor remains, however, whether the course of conduct in question is generally and regularly followed by operators in the branch of international trade in which the parties to the contract operate.
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