Rectification for common mistake requires proof of the actual common intention of all parties to the contract. A finding as to one party's intention alone is insufficient; the court must make findings as to each party's intention. Where a party gives no evidence of an intention inconsistent with the written terms, and the written terms were before that party at the time of execution, rectification will not be ordered. The distinction between 'governing intention' and a concurrent intention to contract on the written terms requires evidence directed to the specific party's priorities, and cannot be established by assumptions about what would 'intuitively' be of paramount significance.
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