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Effect of a written contract

Exceptions to the rule that extrinsic evidence is not admissible to vary a written contract

The principle that written contracts are binding on the parties

The rule that an oral statement cannot vary or contradict a written provision of contract

The rule that where a contract is in writing, any agreement which seeks to vary the original agreement, must be in writing

Whether a written contract can be varied by extrinsic evidence

Whether parties can vary, alter, contradict or add to the terms of a written contract by oral evidence

Whether the terms of a contract can be overriden by evidence of custom or practice

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