43As to the second point, it is clear from paragraph 24 of MSG that actual or presumed awareness of a usage on the part of the parties to a contract can be made out, in particular, by showing either that the parties had previously had commercial or trade relations between themselves or with other parties operating in the sector in question, or that, in that sector, a particular course of conduct is sufficiently well known because it is generally and regularly followed when a particular type of contract is concluded, so that it may be regarded as being an established usage.
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