It is not an essential pre-condition to incorporation of a term by prior course of dealings that the term was incorporated in at least one prior contract, or that the document containing the term was sent prior to or at the time of formation of the prior contracts. However, post-contractual invoices sent after performance, where the parties' consistent practice was to contract orally, are unlikely to provide a sufficient foundation for incorporation of terms by course of dealing, particularly where there is no actual knowledge of the terms and the transactions are not sufficiently numerous or frequent.
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