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(a) For good cause and at any time within the period allowed for appeal after the final termination of the administration of the estate of a decedent or ward, the court may vacate or modify an order or grant a rehearing. However, no such power shall exist as to any order from which an appeal has been taken or to set aside the probate of a will after the time allowed for contest thereof.
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(b) No vacation or modification under this section shall affect any act previously done or any right previously acquired in reliance on such an order or judgment.
