The Alghussein rule of construction — that a party cannot benefit from its own breach — is displaced where the contract contains clear provisions to the contrary, such as an unqualified adjustment mechanism that expressly deals with the consequences of over and understatements. A warranty that a mortgagee 'will release its Mortgage' for a specified amount warrants the maximum amount required for release, not the precise amount, where the commercial context involves allocated amounts across multiple lots with no individual indebtedness per lot.
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