canada energy-law 1451544 a-solemn-promise--enforcement-of-an-undertaking-and-the-doctrine-of-functus-officio canada energy-law 1451544 a-solemn-promise--enforcement-of-an-undertaking-and-the-doctrine-of-functus-officio canada energy-law 1451544 a-solemn-promise--enforcement-of-an-undertaking-and-the-doctrine-of-functus-officio 
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