Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
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under certain circumstances we may also elect to notify you of changes or updates to our terms by additional means , such as pop-up or push notifications within the products or email . 

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. OPTIONS: ["Choice of law", "Jurisdiction", "Content removal", "None", "Arbitration", "Contract by using", "Limitation of liability", "Unilateral change", "Unilateral termination"].